{"id":15974,"date":"2024-07-25T12:10:56","date_gmt":"2024-07-25T08:40:56","guid":{"rendered":"https:\/\/www.itpiran.net\/blog\/?p=15974"},"modified":"2024-07-25T12:10:56","modified_gmt":"2024-07-25T08:40:56","slug":"how-to-work-with-dates-and-times-in-sql","status":"publish","type":"post","link":"https:\/\/www.itpiran.net\/blog\/zh\/tutorials\/how-to-work-with-dates-and-times-in-sql\/","title":{"rendered":"\u5982\u4f55\u5728 SQL \u4e2d\u5904\u7406\u65e5\u671f\u548c\u65f6\u95f4"},"content":{"rendered":"<h2 id=\"%d9%85%d9%82%d8%af%d9%85%d9%87\">\u4ecb\u7ecd<\/h2>\n<p>\u5728\u4f7f\u7528\u5173\u7cfb\u6570\u636e\u5e93\u548c\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00 (SQL) \u65f6\uff0c\u6709\u65f6\u9700\u8981\u5904\u7406\u4ee3\u8868\u7279\u5b9a\u65e5\u671f\u6216\u65f6\u95f4\u7684\u503c\u3002\u4f8b\u5982\uff0c\u53ef\u80fd\u9700\u8981\u8ba1\u7b97\u67d0\u9879\u6d3b\u52a8\u7684\u603b\u8017\u65f6\uff0c\u6216\u8005\u9700\u8981\u4f7f\u7528\u6570\u5b66\u8fd0\u7b97\u7b26\u548c\u51fd\u6570\u805a\u5408\u65e5\u671f\u6216\u65f6\u95f4\u503c\uff0c\u4ee5\u8ba1\u7b97\u5b83\u4eec\u7684\u603b\u548c\u6216\u5e73\u5747\u503c\u3002.<\/p>\n<p>\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u60a8\u5c06\u5b66\u4e60\u5982\u4f55\u5728 SQL \u4e2d\u4f7f\u7528\u65e5\u671f\u548c\u65f6\u95f4\u3002\u9996\u5148\uff0c\u60a8\u5c06\u5b66\u4e60\u5982\u4f55\u4ec5\u4f7f\u7528 SELECT \u8bed\u53e5\u5bf9\u65e5\u671f\u548c\u65f6\u95f4\u8fdb\u884c\u8ba1\u7b97\u5e76\u4f7f\u7528\u5404\u79cd\u51fd\u6570\u3002\u7136\u540e\uff0c\u60a8\u5c06\u901a\u8fc7\u5bf9\u793a\u4f8b\u6570\u636e\u8fd0\u884c\u67e5\u8be2\u8fdb\u884c\u7ec3\u4e60\uff0c\u5e76\u5b66\u4e60\u5982\u4f55\u5b9e\u73b0 CAST \u51fd\u6570\uff0c\u4f7f\u8f93\u51fa\u7ed3\u679c\u66f4\u6613\u4e8e\u9605\u8bfb\u3002.<\/p>\n<h5 id=\"%d9%be%db%8c%d8%b4-%d9%86%db%8c%d8%a7%d8%b2%d9%87%d8%a7\">\u5148\u51b3\u6761\u4ef6<\/h5>\n<p>\u8981\u5b8c\u6210\u672c\u6559\u7a0b\uff0c\u60a8\u9700\u8981\uff1a<\/p>\n<ul>\n<li>\u4e00\u53f0\u8fd0\u884c Ubuntu 20.04 \u7684\u670d\u52a1\u5668\uff0c\u4f7f\u7528\u5177\u6709 sudo \u7ba1\u7406\u6743\u9650\u7684\u975e root \u7528\u6237\uff0c\u5e76\u542f\u7528\u4e86\u9632\u706b\u5899\u3002.<\/li>\n<li>\u670d\u52a1\u5668\u4e0a\u5df2\u5b89\u88c5\u5e76\u914d\u7f6e\u4e86 MySQL \u5b89\u5168\u63aa\u65bd\u3002.<\/li>\n<\/ul>\n<p><span style=\"color: #ff0000;\">\u6ce8\u610f\uff1a\u8bb8\u591a\u5173\u7cfb\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u4f7f\u7528\u5404\u81ea\u72ec\u7279\u7684 SQL \u5b9e\u73b0\u3002\u867d\u7136\u672c\u6559\u7a0b\u4e2d\u63d0\u5230\u7684\u547d\u4ee4\u9002\u7528\u4e8e\u5927\u591a\u6570\u5173\u7cfb\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u4f46\u5982\u679c\u60a8\u5728 MySQL \u4ee5\u5916\u7684\u7cfb\u7edf\u4e0a\u5c1d\u8bd5\u8fd9\u4e9b\u547d\u4ee4\uff0c\u5219\u5177\u4f53\u7684\u8bed\u6cd5\u6216\u8f93\u51fa\u53ef\u80fd\u4f1a\u6709\u6240\u4e0d\u540c\u3002.<\/span><\/p>\n<p>\u8981\u5728\u672c\u6559\u7a0b\u4e2d\u7ec3\u4e60\u4f7f\u7528\u65e5\u671f\u548c\u65f6\u95f4\uff0c\u60a8\u9700\u8981\u4e00\u4e2a\u5df2\u52a0\u8f7d\u793a\u4f8b\u6570\u636e\u7684\u6570\u636e\u5e93\u548c\u8868\u3002\u5982\u679c\u60a8\u8fd8\u6ca1\u6709\u51c6\u5907\u597d\u53ef\u4f9b\u63d2\u5165\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u9605\u8bfb\u201c\u8fde\u63a5\u5230 MySQL \u548c\u8bbe\u7f6e\u793a\u4f8b\u6570\u636e\u5e93\u201d\u90e8\u5206\uff0c\u4e86\u89e3\u5982\u4f55\u521b\u5efa\u6570\u636e\u5e93\u548c\u8868\u3002\u672c\u6559\u7a0b\u5c06\u59cb\u7ec8\u5f15\u7528\u6b64\u793a\u4f8b\u6570\u636e\u5e93\u548c\u8868\u3002.<\/p>\n<h2 id=\"%d8%a7%d8%aa%d8%b5%d8%a7%d9%84-%d8%a8%d9%87-mysql-%d9%88-%d8%b1%d8%a7%d9%87-%d8%a7%d9%86%d8%af%d8%a7%d8%b2%db%8c-%db%8c%da%a9-%d9%be%d8%a7%db%8c%da%af%d8%a7%d9%87-%d8%af%d8%a7%d8%af%d9%87-%d9%86%d9%85\">\u8fde\u63a5\u5230 MySQL \u5e76\u8bbe\u7f6e\u793a\u4f8b\u6570\u636e\u5e93<\/h2>\n<p>\u5982\u679c\u60a8\u7684 SQL \u6570\u636e\u5e93\u8fd0\u884c\u5728\u8fdc\u7a0b\u670d\u52a1\u5668\u4e0a\uff0c\u8bf7\u4ece\u672c\u5730\u8ba1\u7b97\u673a\u901a\u8fc7 SSH \u8fde\u63a5\u5230\u60a8\u7684\u670d\u52a1\u5668\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>ssh sammy@your_server_ip\r\n<\/code><\/pre>\n<\/div>\n<p>\u7136\u540e\uff0c\u6253\u5f00 MySQL \u63d0\u793a\u7b26\uff0c\u5e76\u5c06 Sami \u66ff\u6362\u4e3a\u60a8\u7684 MySQL \u5e10\u6237\u4fe1\u606f\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>mysql -u sammy -p\r\n<\/code><\/pre>\n<\/div>\n<p>\u521b\u5efa\u4e00\u4e2a\u540d\u4e3a datetimeDB \u7684\u6570\u636e\u5e93\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>CREATE DATABASE datetimeDB;\r\n<\/code><\/pre>\n<\/div>\n<p>\u5982\u679c\u6570\u636e\u5e93\u521b\u5efa\u6210\u529f\uff0c\u60a8\u5c06\u6536\u5230\u4ee5\u4e0b\u8f93\u51fa\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\nQuery OK, 1 row affected (0.01 sec)<\/code><\/pre>\n<\/div>\n<p>\u8981\u9009\u62e9 datetimeDB \u6570\u636e\u5e93\uff0c\u8bf7\u8fd0\u884c\u4ee5\u4e0b USE \u8bed\u53e5\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>USE datetimeDB;\r\n<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\nDatabase changed<\/code><\/pre>\n<\/div>\n<p>\u9009\u62e9\u6570\u636e\u5e93\u540e\uff0c\u5728\u5176\u4e2d\u521b\u5efa\u4e00\u4e2a\u8868\u3002\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u6211\u4eec\u5c06\u521b\u5efa\u4e00\u4e2a\u8868\uff0c\u7528\u4e8e\u5b58\u50a8\u4e24\u4f4d\u8dd1\u6b65\u8fd0\u52a8\u5458\u4e00\u5e74\u5185\u53c2\u52a0\u7684\u4e0d\u540c\u6bd4\u8d5b\u7684\u6210\u7ee9\u3002\u8be5\u8868\u5305\u542b\u4ee5\u4e0b\u4e03\u5217\uff1a<\/p>\n<ul>\n<li>race_id\uff1a\u8868\u793a int \u6570\u636e\u7c7b\u578b\u7684\u503c\uff0c\u5e76\u4f5c\u4e3a\u8868\u7684\u4e3b\u952e\uff0c\u8fd9\u610f\u5473\u7740\u6b64\u5217\u4e2d\u7684\u6bcf\u4e2a\u503c\u90fd\u4f5c\u4e3a\u76f8\u5e94\u884c\u7684\u552f\u4e00\u6807\u8bc6\u7b26\u3002.<\/li>\n<li>runner_name\uff1a\u4f7f\u7528 varchar \u6570\u636e\u7c7b\u578b\uff0c\u6700\u591a 30 \u4e2a\u5b57\u7b26\uff0c\u7528\u4e8e\u8868\u793a\u4e24\u4f4d\u8dd1\u8005 Bolt \u548c Felix \u7684\u59d3\u540d\u3002.<\/li>\n<li>race_name\uff1a\u4fdd\u5b58\u6700\u591a 20 \u4e2a\u5b57\u7b26\u7684 varchar \u6570\u636e\u7c7b\u578b\u7684\u79cd\u65cf\u7c7b\u578b\u3002.<\/li>\n<li>start_day\uff1a\u4f7f\u7528 DATE \u6570\u636e\u7c7b\u578b\uff0c\u6839\u636e\u5e74\u3001\u6708\u3001\u65e5\u8ddf\u8e2a\u7279\u5b9a\u6bd4\u8d5b\u7684\u65e5\u671f\u3002\u6b64\u6570\u636e\u7c7b\u578b\u9075\u5faa\u4ee5\u4e0b\u53c2\u6570\uff1a\u5e74\u4efd\u4e3a\u56db\u4f4d\u6570\uff0c\u6708\u4efd\u548c\u65e5\u671f\u6700\u591a\u4e3a\u4e24\u4f4d\u6570\uff08YYYY-MM-DD\uff09\u3002.<\/li>\n<li>start_time\uff1a\u8868\u793a\u6bd4\u8d5b\u7684\u5f00\u59cb\u65f6\u95f4\uff0c\u6570\u636e\u7c7b\u578b\u4e3a TIME\uff0c\u5355\u4f4d\u4e3a\u5c0f\u65f6\u3001\u5206\u949f\u548c\u79d2 (HH:MM:SS)\u3002\u6b64\u6570\u636e\u7c7b\u578b\u9075\u5faa 24 \u5c0f\u65f6\u5236\uff0c\u4f8b\u5982 15:00 \u8868\u793a\u4e0b\u5348 3:00\u3002.<\/li>\n<li>total_miles\uff1a\u663e\u793a\u6bcf\u573a\u6bd4\u8d5b\u7684\u603b\u91cc\u7a0b\u6570\uff0c\u4f7f\u7528\u5341\u8fdb\u5236\u6570\u636e\u7c7b\u578b\uff0c\u56e0\u4e3a\u5f88\u591a\u6bd4\u8d5b\u7684\u603b\u91cc\u7a0b\u6570\u5e76\u975e\u6574\u6570\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5341\u8fdb\u5236\u6570\u7684\u7cbe\u5ea6\u4e3a 3\uff0c\u5c0f\u6570\u4f4d\u6570\u4e3a 1\uff0c\u8fd9\u610f\u5473\u7740\u6b64\u5217\u4e2d\u7684\u6bcf\u4e2a\u503c\u90fd\u53ef\u4ee5\u6709\u4e09\u4f4d\u6570\u5b57\uff0c\u5176\u4e2d\u4e00\u4f4d\u4f4d\u4e8e\u5c0f\u6570\u70b9\u53f3\u4fa7\u3002.<\/li>\n<li>end_time\uff1a\u4f7f\u7528 TIMESTAMP \u6570\u636e\u7c7b\u578b\u6765\u8ddf\u8e2a\u8dd1\u6b65\u8005\u5728\u6bd4\u8d5b\u7ed3\u675f\u65f6\u7684\u65f6\u95f4\u3002\u6b64\u6570\u636e\u7c7b\u578b\u5c06\u65e5\u671f\u548c\u65f6\u95f4\u7ec4\u5408\u6210\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u5176\u683c\u5f0f\u4e3a DATE \u548c TIME \u7684\u7ec4\u5408\uff1a(YYYY-MM-DD HH:MM:SS)\u3002.<\/li>\n<\/ul>\n<p>\u8fd0\u884c CREATE TABLE \u547d\u4ee4\u521b\u5efa\u8868\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>CREATE TABLE race_results (\r\nrace_id int, \r\nrunner_name varchar(30),\r\nrace_name varchar(20), \r\nstart_day DATE,\r\nstart_time TIME, \r\ntotal_miles decimal(3, 1),\r\nend_time TIMESTAMP,\r\nPRIMARY KEY (race_id)\r\n); <\/code><\/pre>\n<\/div>\n<p>\u7136\u540e\u5411\u7a7a\u767d\u8868\u683c\u4e2d\u8f93\u5165\u4e00\u4e9b\u793a\u4f8b\u6570\u636e\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>INSERT INTO race_results\r\n(race_id, runner_name, race_name, start_day, start_time, total_miles, end_time)\r\nVALUES\r\n(1, 'bolt', '1600_meters', '2022-09-18', '7:00:00', 1.0, '2022-09-18 7:06:30'),\r\n(2, 'bolt', '5K', '2022-10-19', '11:00:00', 3.1, '2022-10-19 11:22:31'),\r\n(3, 'bolt', '10K', '2022-11-20', '10:00:00', 6.2, '2022-11-20 10:38:05'),\r\n(4, 'bolt', 'half_marathon', '2022-12-21', '6:00:00', 13.1, '2022-12-21 07:39:04'),\r\n(5, 'bolt', 'full_marathon', '2023-01-22', '8:00:00', 26.2, '2023-01-22 11:23:10'),\r\n(6, 'felix', '1600_meters', '2022-09-18', '7:00:00', 1.0, '2022-09-18 7:07:15'),\r\n(7, 'felix', '5K', '2022-10-19', '11:00:00', 3.1, '2022-10-19 11:30:50'),\r\n(8, 'felix', '10K', '2022-11-20', '10:00:00', 6.2, '2022-11-20 11:10:17'),\r\n(9, 'felix', 'half_marathon', '2022-12-21', '6:00:00', 13.1, '2022-12-21 08:11:57'),\r\n(10, 'felix', 'full_marathon', '2023-01-22', '8:00:00', 26.2, '2023-01-22 12:02:10');<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\nQuery OK, 10 rows affected (0.00 sec)\r\nRecords: 10 Duplicates: 0 Warnings: 0<\/code><\/pre>\n<\/div>\n<p>\u8f93\u5165\u6570\u636e\u540e\uff0c\u5c31\u53ef\u4ee5\u5f00\u59cb\u7ec3\u4e60\u5728 SQL \u4e2d\u4f7f\u7528\u65e5\u671f\u548c\u65f6\u95f4\u8fdb\u884c\u7b97\u672f\u8fd0\u7b97\u548c\u51fd\u6570\u8fd0\u7b97\u4e86\u3002.<\/p>\n<h2 id=\"%d8%a7%d8%b3%d8%aa%d9%81%d8%a7%d8%af%d9%87-%d8%a7%d8%b2-%d8%ad%d8%b3%d8%a7%d8%a8-%d8%a8%d8%a7-%d8%aa%d8%a7%d8%b1%db%8c%d8%ae-%d9%88-%d8%b2%d9%85%d8%a7%d9%86\">\u4f7f\u7528\u5e26\u6709\u65e5\u671f\u548c\u65f6\u95f4\u7684\u5e10\u6237<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u6570\u5b66\u8868\u8fbe\u5f0f\u6765\u64cd\u4f5c\u65e5\u671f\u548c\u65f6\u95f4\u503c\u3002\u60a8\u53ea\u9700\u8981\u4e00\u4e2a\u6570\u5b66\u8fd0\u7b97\u7b26\u548c\u60a8\u60f3\u8981\u8ba1\u7b97\u7684\u503c\u5373\u53ef\u3002.<\/p>\n<p>\u4f8b\u5982\uff0c\u5047\u8bbe\u60a8\u60f3\u67e5\u627e\u6bd4\u53e6\u4e00\u4e2a\u65e5\u671f\u665a\u6307\u5b9a\u5929\u6570\u7684\u65e5\u671f\u3002\u4ee5\u4e0b\u67e5\u8be2\u63a5\u53d7\u4e00\u4e2a\u65e5\u671f\u503c (2022-10-05)\uff0c\u5e76\u52a0\u4e0a 17\uff0c\u8fd4\u56de\u6bd4\u67e5\u8be2\u4e2d\u6307\u5b9a\u7684\u65e5\u671f\u665a 17 \u5929\u7684\u65e5\u671f\u503c\u3002\u8bf7\u6ce8\u610f\uff0c\u6b64\u793a\u4f8b\u5c06 2022-10-05 \u6307\u5b9a\u4e3a DATE \u503c\uff0c\u4ee5\u786e\u4fdd\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u4e0d\u4f1a\u5c06\u5176\u89e3\u91ca\u4e3a\u5b57\u7b26\u4e32\u6216\u5176\u4ed6\u6570\u636e\u7c7b\u578b\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>SELECT DATE '2022-10-05' + 17 AS new_date;\r\n<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\n+----------+\r\n| new_date |\r\n+----------+\r\n| 20221022 |\r\n+----------+\r\n1 row in set (0.01 sec)<\/code><\/pre>\n<\/div>\n<p>\u5982\u8f93\u51fa\u6240\u793a\uff0c2022 \u5e74 10 \u6708 5 \u65e5\u4e4b\u540e\u7684 17 \u5929\u662f 2022 \u5e74 10 \u6708 22 \u65e5\uff0c\u5373 2022 \u5e74 10 \u6708 22 \u65e5\u3002.<\/p>\n<p>\u518d\u4e3e\u4e00\u4e2a\u4f8b\u5b50\uff0c\u5047\u8bbe\u4f60\u60f3\u8ba1\u7b97\u4e24\u4e2a\u4e0d\u540c\u65f6\u95f4\u70b9\u4e4b\u95f4\u7684\u603b\u5c0f\u65f6\u6570\u3002\u4f60\u53ef\u4ee5\u901a\u8fc7\u5c06\u8fd9\u4e24\u4e2a\u65f6\u95f4\u70b9\u76f8\u51cf\u6765\u5b9e\u73b0\u3002\u5bf9\u4e8e\u4ee5\u4e0b\u67e5\u8be2\uff0c11:00 \u662f\u7b2c\u4e00\u4e2a\u65f6\u95f4\u503c\uff0c3:00 \u662f\u7b2c\u4e8c\u4e2a\u65f6\u95f4\u503c\u3002\u8fd9\u91cc\u4f60\u9700\u8981\u6307\u5b9a\u8fd9\u4e24\u4e2a\u503c\u90fd\u662f\u65f6\u95f4\u503c\uff0c\u624d\u80fd\u8fd4\u56de\u5c0f\u65f6\u6570\u7684\u5dee\u503c\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>SELECT TIME '11:00' - TIME '3:00' AS time_diff;\r\n<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\n+-----------+\r\n| time_diff |\r\n+-----------+\r\n| 80000 |\r\n+-----------+\r\n1 row in set (0.00 sec)<\/code><\/pre>\n<\/div>\n<p>\u8f93\u51fa\u7ed3\u679c\u663e\u793a\uff0c11:00 \u548c 3:00 \u4e4b\u95f4\u7684\u5dee\u503c\u4e3a 80,000\uff0c\u5373 8 \u5c0f\u65f6\u3002.<\/p>\n<p>\u73b0\u5728\u7ec3\u4e60\u4f7f\u7528\u793a\u4f8b\u6570\u636e\u4e2d\u7684\u65e5\u671f\u548c\u65f6\u95f4\u4fe1\u606f\u8fdb\u884c\u8ba1\u7b97\u3002\u5bf9\u4e8e\u7b2c\u4e00\u4e2a\u67e5\u8be2\uff0c\u8ba1\u7b97\u8dd1\u6b65\u8005\u5b8c\u6210\u6bcf\u573a\u6bd4\u8d5b\u7684\u603b\u65f6\u95f4\uff0c\u65b9\u6cd5\u662f\u7528\u5f00\u59cb\u65f6\u95f4\u51cf\u53bb\u7ed3\u675f\u65f6\u95f4\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>SELECT runner_name, race_name, end_time - start_time \r\nAS total_time \r\nFROM race_results;<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\n+-------------+---------------+----------------+\r\n| runner_name | race_name | total_time |\r\n+-------------+---------------+----------------+\r\n| bolt | 1600_meters | 20220918000630 |\r\n| bolt | 5K | 20221019002231 |\r\n| bolt | 10K | 20221120003805 |\r\n| bolt | half_marathon | 20221221013904 |\r\n| bolt | full_marathon | 20230122032310 |\r\n| felix | 1600_meters | 20220918000715 |\r\n| felix | 5K | 20221019003050 |\r\n| felix | 10K | 20221120011017 |\r\n| felix | half_marathon | 20221221021157 |\r\n| felix | full_marathon | 20230122040210 |\r\n+-------------+---------------+----------------+\r\n10 rows in set (0.00 sec)<\/code><\/pre>\n<\/div>\n<p>\u4f60\u4f1a\u6ce8\u610f\u5230 total_time \u5217\u7684\u8f93\u51fa\u5f88\u957f\uff0c\u96be\u4ee5\u9605\u8bfb\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u5411\u4f60\u5c55\u793a\u5982\u4f55\u4f7f\u7528 CAST \u51fd\u6570\u8f6c\u6362\u8fd9\u4e9b\u6570\u636e\u503c\uff0c\u4f7f\u5176\u66f4\u6613\u4e8e\u9605\u8bfb\u3002.<\/p>\n<p>\u5982\u679c\u60a8\u53ea\u5bf9\u6bcf\u4f4d\u8dd1\u8005\u5728\u957f\u8ddd\u79bb\u6bd4\u8d5b\uff08\u4f8b\u5982\u534a\u7a0b\u9a6c\u62c9\u677e\u548c\u5168\u7a0b\u9a6c\u62c9\u677e\uff09\u4e2d\u7684\u8868\u73b0\u611f\u5174\u8da3\uff0c\u60a8\u53ef\u4ee5\u67e5\u8be2\u6570\u636e\u6765\u68c0\u7d22\u8be5\u4fe1\u606f\u3002\u5bf9\u4e8e\u6b64\u67e5\u8be2\uff0c\u8bf7\u4ece start_time \u4e2d\u51cf\u53bb end_time\uff0c\u5e76\u4f7f\u7528 WHERE \u5b50\u53e5\u9650\u5236\u7ed3\u679c\uff0c\u4ee5\u68c0\u7d22 total_miles \u5927\u4e8e 12 \u7684\u6570\u636e\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>SELECT runner_name, race_name, end_time - start_time AS half_full_results\r\nFROM race_results \r\nWHERE total_miles &gt; 12;<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\n+-------------+---------------+-------------------+\r\n| runner_name | race_name | half_full_results |\r\n+-------------+---------------+-------------------+\r\n| bolt | half_marathon | 20221221013904 |\r\n| bolt | full_marathon | 20230122032310 |\r\n| felix | half_marathon | 20221221021157 |\r\n| felix | full_marathon | 20230122040210 |\r\n+-------------+---------------+-------------------+\r\n4 rows in set (0.00 sec)<\/code><\/pre>\n<\/div>\n<p>\u5728\u672c\u8282\u4e2d\uff0c\u60a8\u4f7f\u7528 SELECT \u8bed\u53e5\u5bf9\u793a\u4f8b\u6570\u636e\u8fdb\u884c\u4e86\u4e00\u4e9b\u65e5\u671f\u548c\u65f6\u95f4\u8ba1\u7b97\uff0c\u4ee5\u8fbe\u5230\u5b9e\u8df5\u76ee\u7684\u3002\u63a5\u4e0b\u6765\uff0c\u60a8\u5c06\u7ec3\u4e60\u4f7f\u7528\u5404\u79cd\u65e5\u671f\u548c\u65f6\u95f4\u51fd\u6570\u7f16\u5199\u67e5\u8be2\u3002.<\/p>\n<h2 id=\"%d8%a7%d8%b3%d8%aa%d9%81%d8%a7%d8%af%d9%87-%d8%a7%d8%b2-%d8%aa%d9%88%d8%a7%d8%a8%d8%b9-%d8%aa%d8%a7%d8%b1%db%8c%d8%ae-%d9%88-%d8%b2%d9%85%d8%a7%d9%86-%d9%88-%d8%b9%d8%a8%d8%a7%d8%b1%d8%a7%d8%aa-%d8%a8\">\u4f7f\u7528\u65e5\u671f\u548c\u65f6\u95f4\u51fd\u6570\u4ee5\u53ca\u8303\u56f4\u8868\u8fbe\u5f0f<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u591a\u79cd\u51fd\u6570\u6765\u67e5\u627e\u548c\u64cd\u4f5c\u65e5\u671f\u548c\u65f6\u95f4\u503c\u3002SQL \u51fd\u6570\u901a\u5e38\u7528\u4e8e\u5904\u7406\u6216\u64cd\u4f5c\u6570\u636e\uff0c\u53ef\u7528\u7684\u51fd\u6570\u53d6\u51b3\u4e8e SQL \u7684\u5177\u4f53\u5b9e\u73b0\u3002\u4e0d\u8fc7\uff0c\u5927\u591a\u6570 SQL \u5b9e\u73b0\u90fd\u5141\u8bb8\u901a\u8fc7\u67e5\u8be2 `current_date` \u548c `current_time` \u7684\u503c\u6765\u83b7\u53d6\u5f53\u524d\u65e5\u671f\u548c\u65f6\u95f4\u3002.<\/p>\n<p>\u4f8b\u5982\uff0c\u8981\u67e5\u627e\u4eca\u5929\u7684\u65e5\u671f\uff0c\u8bed\u6cd5\u5f88\u7b80\u5355\uff0c\u53ea\u9700\u8981 SELECT \u8bed\u53e5\u548c current_date \u51fd\u6570\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>SELECT current_date;\r\n<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\n+--------------+\r\n| current_date |\r\n+--------------+\r\n| 2022-02-15 |\r\n+--------------+\r\n1 row in set (0.00 sec)<\/code><\/pre>\n<\/div>\n<p>\u4f7f\u7528\u76f8\u540c\u7684\u8bed\u6cd5\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528 current_time \u51fd\u6570\u67e5\u627e\u5f53\u524d\u65f6\u95f4\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>SELECT current_time;\r\n<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\n+--------------+\r\n| current_time |\r\n+--------------+\r\n| 17:10:20 |\r\n+--------------+\r\n1 row in set (0.00 sec)<\/code><\/pre>\n<\/div>\n<p>\u5982\u679c\u60a8\u5e0c\u671b\u67e5\u8be2\u8f93\u51fa\u4e2d\u7684\u65e5\u671f\u548c\u65f6\u95f4\uff0c\u8bf7\u4f7f\u7528 current_timestamp \u51fd\u6570\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>SELECT current_timestamp;\r\n<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\n+---------------------+\r\n| current_timestamp |\r\n+---------------------+\r\n| 2022-02-15 19:09:58 |\r\n+---------------------+\r\n1 row in set (0.00 sec)<\/code><\/pre>\n<\/div>\n<p>\u60a8\u53ef\u4ee5\u5728\u7c7b\u4f3c\u4e8e\u4e0a\u4e00\u8282\u7684\u7b97\u672f\u51fd\u6570\u4e2d\u4f7f\u7528\u65e5\u671f\u548c\u65f6\u95f4\u51fd\u6570\u3002\u4f8b\u5982\uff0c\u5047\u8bbe\u60a8\u60f3\u77e5\u9053 11 \u5929\u524d\u7684\u65e5\u671f\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u4e0e\u67e5\u8be2 current_date \u51fd\u6570\u76f8\u540c\u7684\u8bed\u6cd5\uff0c\u7136\u540e\u4ece\u4e2d\u51cf\u53bb 11 \u5373\u53ef\u627e\u5230 11 \u5929\u524d\u7684\u65e5\u671f\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>SELECT current_date - 11;\r\n<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\n+-------------------+\r\n| current_date - 11 |\r\n+-------------------+\r\n| 20220206 |\r\n+-------------------+\r\n1 row in set (0.01 sec)<\/code><\/pre>\n<\/div>\n<p>\u5982\u8f93\u51fa\u6240\u793a\uff0c\u5f53\u524d\u65e5\u671f\uff08\u64b0\u5199\u672c\u6587\u65f6\uff09\u4e4b\u524d\u7684 11 \u5929\u662f 2022 \u5e74 2 \u6708 6 \u65e5\uff0c\u5373 2022 \u5e74 2 \u6708 6 \u65e5\u3002\u73b0\u5728\u5c1d\u8bd5\u76f8\u540c\u7684\u64cd\u4f5c\uff0c\u4f46\u5c06 current_date \u66ff\u6362\u4e3a current_time \u51fd\u6570\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>SELECT current_time - 11;\r\n<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\n+-------------------+\r\n| current_time - 11 |\r\n+-------------------+\r\n| 233639 |\r\n+-------------------+\r\n1 row in set (0.00 sec)<\/code><\/pre>\n<\/div>\n<p>\u6b64\u8f93\u51fa\u8868\u660e\uff0c\u4ece current_time \u503c\u4e2d\u51cf\u53bb 11 \u65f6\uff0c\u5b9e\u9645\u51cf\u53bb\u7684\u662f 11 \u79d2\u3002\u60a8\u4e4b\u524d\u4f7f\u7528 current_date \u51fd\u6570\u6267\u884c\u7684\u64cd\u4f5c\u5c06 11 \u89e3\u91ca\u4e3a\u5929\u6570\uff0c\u800c\u4e0d\u662f\u79d2\u6570\u3002\u8fd9\u79cd\u6570\u5b57\u89e3\u91ca\u65b9\u5f0f\u7684\u4e0d\u4e00\u81f4\u5728\u4f7f\u7528\u65e5\u671f\u548c\u65f6\u95f4\u51fd\u6570\u65f6\u53ef\u80fd\u4f1a\u9020\u6210\u6df7\u6dc6\u3002\u8bb8\u591a\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u5141\u8bb8\u60a8\u4f7f\u7528 INTERVAL \u8bed\u53e5\u66f4\u660e\u786e\u5730\u5904\u7406\u65e5\u671f\u548c\u65f6\u95f4\u503c\uff0c\u800c\u4e0d\u662f\u8981\u6c42\u60a8\u4f7f\u7528\u6b64\u7c7b\u8ba1\u7b97\u6765\u64cd\u4f5c\u5b83\u4eec\u3002.<\/p>\n<p>INTERVAL \u8868\u8fbe\u5f0f\u5141\u8bb8\u60a8\u6307\u5b9a\u65e5\u671f\u6216\u65f6\u95f4\u8868\u8fbe\u5f0f\u6307\u5b9a\u65f6\u95f4\u6bb5\u4e4b\u524d\u6216\u4e4b\u540e\u7684\u65e5\u671f\u6216\u65f6\u95f4\u3002\u5b83\u4eec\u5fc5\u987b\u91c7\u7528\u4ee5\u4e0b\u5f62\u5f0f\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>INTERVAL value unit\r\n<\/code><\/pre>\n<\/div>\n<p>\u4f8b\u5982\uff0c\u8981\u67e5\u627e\u4e94\u5929\u540e\u7684\u65e5\u671f\uff0c\u60a8\u53ef\u4ee5\u8fd0\u884c\u4ee5\u4e0b\u67e5\u8be2\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>SELECT current_date + INTERVAL '5' DAY AS \"5_days_from_today\";\r\n<\/code><\/pre>\n<\/div>\n<p>\u6b64\u793a\u4f8b\u9996\u5148\u83b7\u53d6 current_date \u7684\u503c\uff0c\u7136\u540e\u52a0\u4e0a\u533a\u95f4\u8868\u8fbe\u5f0f INTERVAL &#039;5&#039; DAY\u3002\u8fd9\u5c06\u8fd4\u56de 5 \u5929\u540e\u7684\u65e5\u671f\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\n+-------------------+\r\n| 5_days_from_today |\r\n+-------------------+\r\n| 2022-03-06 |\r\n+-------------------+\r\n1 row in set (0.00 sec)<\/code><\/pre>\n<\/div>\n<p>\u8fd9\u6bd4\u4e0b\u9762\u7684\u67e5\u8be2\u8bed\u53e5\u8981\u6e05\u6670\u5f97\u591a\uff0c\u540e\u8005\u867d\u7136\u8f93\u51fa\u7ed3\u679c\u76f8\u4f3c\u4f46\u4e0d\u5b8c\u5168\u76f8\u540c\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>SELECT current_date + 5 AS \"5_days_from_today\";\r\n<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\n+-------------------+\r\n| 5_days_from_today |\r\n+-------------------+\r\n| 20220306 |\r\n+-------------------+\r\n1 row in set (0.00 sec)<\/code><\/pre>\n<\/div>\n<p>\u8bf7\u6ce8\u610f\uff0c\u60a8\u53ef\u4ee5\u4ece\u65e5\u671f\u6216\u65f6\u95f4\u4e2d\u51cf\u53bb\u65f6\u95f4\u95f4\u9694\uff0c\u4ee5\u67e5\u627e\u6307\u5b9a\u65e5\u671f\u503c\u4e4b\u524d\u7684\u6570\u503c\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>SELECT current_date - INTERVAL '7' MONTH AS \"7_months_ago\";\r\n<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\n+--------------+\r\n| 7_months_ago |\r\n+--------------+\r\n| 2021-08-01 |\r\n+--------------+\r\n1 row in set (0.00 sec)<\/code><\/pre>\n<\/div>\n<p>INTERVAL \u8bed\u53e5\u4e2d\u53ef\u4f7f\u7528\u7684\u5355\u4f4d\u53d6\u51b3\u4e8e\u60a8\u9009\u62e9\u7684\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf (DBMS)\uff0c\u4e0d\u8fc7\u5927\u591a\u6570 DBMS \u90fd\u4f1a\u63d0\u4f9b\u8bf8\u5982 HOUR\u3001MINUTE \u548c SECOND \u4e4b\u7c7b\u7684\u9009\u9879\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>SELECT current_time + INTERVAL '6' HOUR AS \"6_hours_from_now\",\r\ncurrent_time - INTERVAL '5' MINUTE AS \"5_minutes_ago\",\r\ncurrent_time + INTERVAL '20' SECOND AS \"20_seconds_from_now\";<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\n+------------------+---------------+---------------------+\r\n| 6_hours_from_now | 5_minutes_ago | 20_seconds_from_now |\r\n+------------------+---------------+---------------------+\r\n| 07:51:43 | 01:46:43 | 01:52:03.000000 |\r\n+------------------+---------------+---------------------+\r\n1 row in set (0.00 sec)<\/code><\/pre>\n<\/div>\n<p>\u73b0\u5728\u4f60\u5df2\u7ecf\u4e86\u89e3\u4e86\u533a\u95f4\u8868\u8fbe\u5f0f\u4ee5\u53ca\u4e00\u4e9b\u65e5\u671f\u548c\u65f6\u95f4\u51fd\u6570\uff0c\u8bf7\u7ee7\u7eed\u7ec3\u4e60\u4f7f\u7528\u4f60\u5728\u7b2c\u4e00\u6b65\u4e2d\u8f93\u5165\u7684\u793a\u4f8b\u6570\u636e\u3002.<\/p>\n<h2 id=\"%d8%a7%d8%b3%d8%aa%d9%81%d8%a7%d8%af%d9%87-%d8%a7%d8%b2-%d8%aa%d9%88%d8%a7%d8%a8%d8%b9-cast-%d9%88-aggregate-%d8%a8%d8%a7-%d8%aa%d8%a7%d8%b1%db%8c%d8%ae-%d9%88-%d8%b2%d9%85%d8%a7%d9%86\">\u4f7f\u7528 CAST \u548c\u805a\u5408\u51fd\u6570\u5904\u7406\u65e5\u671f\u548c\u65f6\u95f4<\/h2>\n<p>\u56de\u60f3\u4e00\u4e0b\u201c\u4f7f\u7528\u65e5\u671f\u548c\u65f6\u95f4\u8fdb\u884c\u7b97\u672f\u8fd0\u7b97\u201d\u90e8\u5206\u4e2d\u7684\u7b2c\u4e09\u4e2a\u793a\u4f8b\uff0c\u5f53\u65f6\u60a8\u8fd0\u884c\u4e86\u4ee5\u4e0b\u67e5\u8be2\uff0c\u7528 start_time \u51cf\u53bb end_time\uff0c\u4ee5\u8ba1\u7b97\u6bcf\u4f4d\u8dd1\u8005\u5728\u6bcf\u573a\u6bd4\u8d5b\u4e2d\u8dd1\u7684\u603b\u5c0f\u65f6\u6570\u3002\u4f46\u662f\uff0c\u8f93\u51fa\u7ed3\u679c\u4e2d\u6709\u4e00\u5217\u5305\u542b\u975e\u5e38\u957f\u7684\u5185\u5bb9\uff0c\u8be5\u5185\u5bb9\u9075\u5faa\u8868\u4e2d\u8bbe\u7f6e\u7684 TIMESTAMP \u6570\u636e\u7c7b\u578b\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>SELECT runner_name, race_name, end_time - start_time \r\nAS total_time \r\nFROM race_results;<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\n+-------------+---------------+----------------+\r\n| runner_name | race_name | total_time |\r\n+-------------+---------------+----------------+\r\n| bolt | 1600_meters | 20220918000630 |\r\n| bolt | 5K | 20221019002231 |\r\n| bolt | 10K | 20221120003805 |\r\n| bolt | half_marathon | 20221221013904 |\r\n| bolt | full_marathon | 20230122032310 |\r\n| felix | 1600_meters | 20220918000715 |\r\n| felix | 5K | 20221019003050 |\r\n| felix | 10K | 20221120011017 |\r\n| felix | half_marathon | 20221221021157 |\r\n| felix | full_marathon | 20230122040210 |\r\n+-------------+---------------+----------------+\r\n10 rows in set (0.00 sec)<\/code><\/pre>\n<\/div>\n<p>\u7531\u4e8e\u60a8\u5bf9\u4e24\u4e2a\u6570\u636e\u7c7b\u578b\u4e0d\u540c\u7684\u5217\u6267\u884c\u64cd\u4f5c\uff08end_time \u5305\u542b TIMESTAMP \u503c\uff0cstart_time \u5305\u542b TIME \u503c\uff09\uff0c\u6570\u636e\u5e93\u65e0\u6cd5\u786e\u5b9a\u5728\u6253\u5370\u64cd\u4f5c\u7ed3\u679c\u65f6\u5e94\u4f7f\u7528\u54ea\u79cd\u6570\u636e\u7c7b\u578b\u3002\u56e0\u6b64\uff0c\u5b83\u4f1a\u5c06\u8fd9\u4e24\u4e2a\u503c\u90fd\u8f6c\u6362\u4e3a\u6574\u6570\u4ee5\u6267\u884c\u64cd\u4f5c\uff0c\u5bfc\u81f4 total_time \u5217\u4e2d\u51fa\u73b0\u957f\u6574\u578b\u6570\u5b57\u3002.<\/p>\n<p>\u4e3a\u4e86\u4f7f\u8fd9\u4e9b\u6570\u636e\u66f4\u6613\u4e8e\u9605\u8bfb\u548c\u7406\u89e3\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528 CAST \u51fd\u6570\u5c06\u8fd9\u4e9b\u957f\u6574\u578b\u503c\u8f6c\u6362\u4e3a TIME \u6570\u636e\u7c7b\u578b\u3002\u4e3a\u6b64\uff0c\u8bf7\u5148\u8f93\u5165 CAST\uff0c\u7136\u540e\u7d27\u8ddf\u4e00\u4e2a\u5de6\u62ec\u53f7\uff0c\u63a5\u7740\u8f93\u5165\u8981\u8f6c\u6362\u7684\u503c\uff0c\u6700\u540e\u8f93\u5165 AS \u5173\u952e\u5b57\u548c\u8981\u8f6c\u6362\u6210\u7684\u6570\u636e\u7c7b\u578b\u3002.<\/p>\n<p>\u4ee5\u4e0b\u67e5\u8be2\u4e0e\u524d\u9762\u7684\u793a\u4f8b\u76f8\u540c\uff0c\u4f46\u4f7f\u7528 CAST \u51fd\u6570\u5c06 total_time \u5217\u8f6c\u6362\u4e3a\u65f6\u95f4\u6570\u636e\u7c7b\u578b\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>SELECT runner_name, race_name, CAST(end_time - start_time AS time)\r\nAS total_time \r\nFROM race_results;<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\n+-------------+---------------+------------+\r\n| runner_name | race_name | total_time |\r\n+-------------+---------------+------------+\r\n| bolt | 1600_meters | 00:06:30 |\r\n| bolt | 5K | 00:22:31 |\r\n| bolt | 10K | 00:38:05 |\r\n| bolt | half_marathon | 01:39:04 |\r\n| bolt | full_marathon | 03:23:10 |\r\n| felix | 1600_meters | 00:07:15 |\r\n| felix | 5K | 00:30:50 |\r\n| felix | 10K | 01:10:17 |\r\n| felix | half_marathon | 02:11:57 |\r\n| felix | full_marathon | 04:02:10 |\r\n+-------------+---------------+------------+\r\n10 rows in set (0.00 sec)<\/code><\/pre>\n<\/div>\n<p>CAST \u5c06\u6b64\u8f93\u51fa\u4e2d\u7684\u6570\u636e\u503c\u8f6c\u6362\u4e3a\u65f6\u95f4\uff0c\u4f7f\u5176\u66f4\u6613\u4e8e\u9605\u8bfb\u548c\u7406\u89e3\u3002.<\/p>\n<p>\u73b0\u5728\uff0c\u8ba9\u6211\u4eec\u7ed3\u5408\u4f7f\u7528\u805a\u5408\u51fd\u6570\u548c CAST \u51fd\u6570\uff0c\u627e\u51fa\u6bcf\u4f4d\u8dd1\u8005\u7684\u6700\u77ed\u3001\u6700\u957f\u548c\u603b\u7528\u65f6\u3002\u9996\u5148\uff0c\u4f7f\u7528 MIN \u51fd\u6570\u67e5\u627e\u6700\u77ed\u7528\u65f6\u3002\u540c\u6837\uff0c\u4e3a\u4e86\u6e05\u6670\u8d77\u89c1\uff0c\u60a8\u9700\u8981\u4f7f\u7528 CAST \u51fd\u6570\u5c06 TIMESTAMP \u6570\u636e\u503c\u8f6c\u6362\u4e3a TIME \u6570\u636e\u503c\u3002\u8bf7\u6ce8\u610f\uff0c\u5f53\u50cf\u672c\u4f8b\u4e2d\u4e00\u6837\u4f7f\u7528\u4e24\u4e2a\u51fd\u6570\u65f6\uff0c\u9700\u8981\u4e24\u5bf9\u62ec\u53f7\uff0c\u5e76\u4e14\u603b\u7528\u65f6\uff08end_time - start_time\uff09\u7684\u8ba1\u7b97\u5fc5\u987b\u653e\u5728\u5176\u4e2d\u4e00\u5bf9\u62ec\u53f7\u5185\u3002\u6700\u540e\uff0c\u6dfb\u52a0 GROUP BY \u5b50\u53e5\uff0c\u6309 runner_name \u5217\u5bf9\u8fd9\u4e9b\u503c\u8fdb\u884c\u5206\u7ec4\uff0c\u4ee5\u663e\u793a\u8dd1\u8005\u7684\u6bd4\u8d5b\u7ed3\u679c\u8f93\u51fa\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>SELECT runner_name, MIN(CAST(end_time - start_time AS time)) AS min_time\r\nFROM race_results GROUP BY runner_name;<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\n+-------------+----------+\r\n| runner_name | min_time |\r\n+-------------+----------+\r\n| bolt | 00:06:30 |\r\n| felix | 00:07:15 |\r\n+-------------+----------+\r\n2 rows in set (0.00 sec)<\/code><\/pre>\n<\/div>\n<p>\u8be5\u8f93\u51fa\u7ed3\u679c\u663e\u793a\u4e86\u8dd1\u6b65\u8005\u7684\u6700\u77ed\u65f6\u95f4\uff0c\u5728\u672c\u4f8b\u4e2d\uff0c\u535a\u5c14\u7279\u7684\u6700\u77ed\u65f6\u95f4\u4e3a 6 \u5206 30 \u79d2\uff0c\u83f2\u5229\u514b\u65af\u7684\u6700\u77ed\u65f6\u95f4\u4e3a 7 \u5206 15 \u79d2\u3002.<\/p>\n<p>\u63a5\u4e0b\u6765\uff0c\u627e\u51fa\u6bcf\u4e2a\u8fd0\u884c\u5668\u7684\u6700\u957f\u6267\u884c\u65f6\u95f4\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528\u4e0e\u4e0a\u4e00\u6761\u8bed\u53e5\u76f8\u540c\u7684\u8bed\u6cd5\uff0c\u4f46\u8fd9\u6b21\u5c06 MIN \u66ff\u6362\u4e3a MAX\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>SELECT runner_name, MAX(CAST(end_time - start_time AS time)) AS max_time\r\nFROM race_results GROUP BY runner_name;<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\n+-------------+----------+\r\n| runner_name | max_time |\r\n+-------------+----------+\r\n| bolt | 03:23:10 |\r\n| felix | 04:02:10 |\r\n+-------------+----------+\r\n2 rows in set (0.00 sec)<\/code><\/pre>\n<\/div>\n<p>\u8f93\u51fa\u7ed3\u679c\u663e\u793a\uff0cBolt \u7684\u6700\u957f\u8fd0\u884c\u65f6\u95f4\u4e3a 3 \u5c0f\u65f6 23 \u5206 10 \u79d2\uff0c\u800c Felix \u7684\u6700\u957f\u8fd0\u884c\u65f6\u95f4\u4e3a 4 \u5c0f\u65f6 2 \u5206 10 \u79d2\u3002.<\/p>\n<p>\u73b0\u5728\u6211\u4eec\u6765\u67e5\u8be2\u6bcf\u4f4d\u8dd1\u8005\u8dd1\u6b65\u603b\u65f6\u957f\u7684\u6982\u8981\u4fe1\u606f\u3002\u5bf9\u4e8e\u6b64\u67e5\u8be2\uff0c\u8bf7\u4f7f\u7528 SUM \u51fd\u6570\u6839\u636e end_time - start_time \u8ba1\u7b97\u603b\u65f6\u957f\uff0c\u5e76\u4f7f\u7528 CAST \u51fd\u6570\u5c06\u8fd9\u4e9b\u6570\u636e\u503c\u8f6c\u6362\u4e3a\u65f6\u95f4\u7c7b\u578b\u3002\u522b\u5fd8\u4e86\u6dfb\u52a0 GROUP BY \u5b50\u53e5\uff0c\u4ee5\u4fbf\u5bf9\u6bcf\u4f4d\u8dd1\u8005\u7684\u7ed3\u679c\u503c\u8fdb\u884c\u6392\u5e8f\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>SELECT runner_name, SUM(CAST(end_time - start_time AS time))\r\nAS total_hours FROM race_results GROUP BY runner_name;<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\n+-------------+-------------+\r\n| runner_name | total_hours |\r\n+-------------+-------------+\r\n| bolt | 52880 |\r\n| felix | 76149 |\r\n+-------------+-------------+\r\n2 rows in set (0.00 sec)<\/code><\/pre>\n<\/div>\n<p>\u6709\u8da3\u7684\u662f\uff0c\u8fd9\u4e2a\u8f93\u51fa\u663e\u793a MySQL \u5c06\u603b\u65f6\u95f4\u89e3\u91ca\u4e3a\u6574\u6570\u3002\u5982\u679c\u6211\u4eec\u628a\u8fd9\u4e9b\u7ed3\u679c\u89e3\u8bfb\u4e3a\u65f6\u95f4\uff0cBolt \u7684\u603b\u65f6\u95f4\u5c06\u88ab\u5206\u4e3a 5 \u5c0f\u65f6 28 \u5206 80 \u79d2\uff0c\u800c Felix \u7684\u65f6\u95f4\u5c06\u88ab\u5206\u4e3a 7 \u5c0f\u65f6 61 \u5206 49 \u79d2\u3002\u6b63\u5982\u4f60\u6240\u770b\u5230\u7684\uff0c\u8fd9\u4e0d\u662f\u4e00\u4e2a\u5408\u7406\u7684\u65f6\u95f4\u5212\u5206\uff0c\u8868\u660e\u5b83\u662f\u88ab\u5f53\u4f5c\u6574\u6570\u800c\u4e0d\u662f\u65f6\u95f4\u6765\u8ba1\u7b97\u7684\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u5728\u5176\u4ed6\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff08\u4f8b\u5982 PostgreSQL\uff09\u4e2d\u5c1d\u8bd5\u540c\u6837\u7684\u67e5\u8be2\uff0c\u7ed3\u679c\u4f1a\u7565\u6709\u4e0d\u540c\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>SELECT runner_name, SUM(CAST(end_time - start_time AS time))\r\nAS total_hours FROM race_results GROUP BY runner_name;<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\nrunner_name | total_hours\r\n-------------+-------------\r\nfelix | 10:01:44\r\nbolt | 06:09:20\r\n(2 rows)<\/code><\/pre>\n<\/div>\n<p>\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cPostgreSQL \u4e2d\u7684\u67e5\u8be2\u4f1a\u5c06\u8fd9\u4e9b\u503c\u89e3\u91ca\u4e3a\u65f6\u95f4\u5e76\u8fdb\u884c\u76f8\u5e94\u7684\u8ba1\u7b97\uff0c\u56e0\u6b64 Felix \u7684\u6210\u7ee9\u603b\u8ba1\u4e3a 10 \u5c0f\u65f6 1 \u5206 44 \u79d2\uff0c\u800c Bolt \u7684\u6210\u7ee9\u4e3a 6 \u5c0f\u65f6 9 \u5206 20 \u79d2\u3002\u8fd9\u8bf4\u660e\u5373\u4f7f\u4f7f\u7528\u76f8\u540c\u7684\u67e5\u8be2\u548c\u6570\u636e\u96c6\uff0c\u4e0d\u540c\u7684\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf (DBMS) \u5b9e\u73b0\u4e5f\u53ef\u80fd\u5bf9\u6570\u636e\u503c\u7684\u89e3\u91ca\u6709\u6240\u4e0d\u540c\u3002.<\/p>\n<h2 id=\"%d9%86%d8%aa%db%8c%d8%ac%d9%87\">\u7ed3\u679c<\/h2>\n<p>\u4e86\u89e3\u5982\u4f55\u5728 SQL \u4e2d\u4f7f\u7528\u65e5\u671f\u548c\u65f6\u95f4\u5bf9\u4e8e\u641c\u7d22\u7279\u5b9a\u7ed3\u679c\uff08\u4f8b\u5982\u5206\u949f\u3001\u79d2\u3001\u5c0f\u65f6\u3001\u5929\u3001\u6708\u3001\u5e74\uff0c\u6216\u5b83\u4eec\u7684\u7ec4\u5408\uff09\u975e\u5e38\u6709\u7528\u3002\u6b64\u5916\uff0cSQL \u8fd8\u63d0\u4f9b\u4e86\u8bb8\u591a\u65e5\u671f\u548c\u65f6\u95f4\u51fd\u6570\uff0c\u53ef\u4ee5\u66f4\u8f7b\u677e\u5730\u67e5\u627e\u7279\u5b9a\u503c\uff0c\u4f8b\u5982\u5f53\u524d\u65e5\u671f\u6216\u65f6\u95f4\u3002\u867d\u7136\u672c\u6559\u7a0b\u4ec5\u6db5\u76d6 SQL \u4e2d\u65e5\u671f\u548c\u65f6\u95f4\u7684\u52a0\u51cf\u8fd0\u7b97\uff0c\u4f46\u60a8\u53ef\u4ee5\u4f7f\u7528\u4efb\u4f55\u6570\u5b66\u8868\u8fbe\u5f0f\u6765\u5904\u7406\u65e5\u671f\u548c\u65f6\u95f4\u503c\u3002\u8bf7\u53c2\u9605\u6211\u4eec\u7684\u6570\u5b66\u8868\u8fbe\u5f0f\u548c\u52a0\u6cd5\u51fd\u6570\u6307\u5357\uff0c\u4e86\u89e3\u66f4\u591a\u4fe1\u606f\uff0c\u5e76\u5c06\u5176\u5e94\u7528\u4e8e\u60a8\u7684\u65e5\u671f\u548c\u65f6\u95f4\u641c\u7d22\u4e2d\u3002.<\/p>","protected":false},"excerpt":{"rendered":"\u5f15\u8a00 \u5728\u4f7f\u7528\u5173\u7cfb\u6570\u636e\u5e93\u548c\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00 (SQL) \u65f6\uff0c\u60a8\u53ef\u80fd\u4f1a\u9047\u5230\u4ee5\u4e0b\u60c5\u51b5\u2026\u2026","protected":false},"author":1,"featured_media":15975,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"\u0646\u062d\u0648\u0647 \u06a9\u0627\u0631 \u0628\u0627 \u062a\u0627\u0631\u06cc\u062e \u0648 \u0632\u0645\u0627\u0646 \u062f\u0631 SQL","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_yoast_wpseo_canonical":"","_yoast_wpseo_opengraph-description":"","_yoast_wpseo_opengraph-image":"","_yoast_wpseo_twitter-description":"","_yoast_wpseo_twitter-image":"","_yoast_wpseo_focuskeywords":"","_yoast_wpseo_primary_category":"193","footnotes":""},"categories":[193,349],"tags":[403,391],"class_list":{"0":"post-15974","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-tutorials","8":"category-database","9":"tag-data-base","10":"tag-mysql"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u0646\u062d\u0648\u0647 \u06a9\u0627\u0631 \u0628\u0627 \u062a\u0627\u0631\u06cc\u062e \u0648 \u0632\u0645\u0627\u0646 \u062f\u0631 SQL - \u0628\u0644\u0627\u06af ITPiran<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.itpiran.net\/blog\/zh\/tutorials\/how-to-work-with-dates-and-times-in-sql\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u0646\u062d\u0648\u0647 \u06a9\u0627\u0631 \u0628\u0627 \u062a\u0627\u0631\u06cc\u062e \u0648 \u0632\u0645\u0627\u0646 \u062f\u0631 SQL - \u0628\u0644\u0627\u06af ITPiran\" \/>\n<meta property=\"og:description\" content=\"\u0645\u0642\u062f\u0645\u0647 \u0647\u0646\u06af\u0627\u0645 \u06a9\u0627\u0631 \u0628\u0627 \u067e\u0627\u06cc\u06af\u0627\u0647 \u0647\u0627\u06cc \u062f\u0627\u062f\u0647 \u0631\u0627\u0628\u0637\u0647 \u0627\u06cc \u0648 \u0632\u0628\u0627\u0646 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0633\u0627\u062e\u062a\u0627\u0631\u06cc\u0627\u0641\u062a\u0647 (SQL)\u060c \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a&hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.itpiran.net\/blog\/zh\/tutorials\/how-to-work-with-dates-and-times-in-sql\/\" \/>\n<meta property=\"og:site_name\" content=\"\u0628\u0644\u0627\u06af ITPiran\" \/>\n<meta property=\"article:published_time\" content=\"2024-07-25T08:40:56+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/cdn.itpiran.net\/2024\/07\/25111554\/SQL-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1793\" \/>\n\t<meta property=\"og:image:height\" content=\"1110\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/tutorials\\\/how-to-work-with-dates-and-times-in-sql\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/tutorials\\\/how-to-work-with-dates-and-times-in-sql\\\/\"},\"author\":{\"name\":\"admin\",\"@id\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/#\\\/schema\\\/person\\\/04ed27b919baca468a2273f8e4318f81\"},\"headline\":\"\u0646\u062d\u0648\u0647 \u06a9\u0627\u0631 \u0628\u0627 \u062a\u0627\u0631\u06cc\u062e \u0648 \u0632\u0645\u0627\u0646 \u062f\u0631 SQL\",\"datePublished\":\"2024-07-25T08:40:56+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/tutorials\\\/how-to-work-with-dates-and-times-in-sql\\\/\"},\"wordCount\":182,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/tutorials\\\/how-to-work-with-dates-and-times-in-sql\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/cdn.itpiran.net\\\/2024\\\/07\\\/25111554\\\/SQL-1.jpg\",\"keywords\":[\"data base\",\"MySQL\"],\"articleSection\":[\"\u0622\u0645\u0648\u0632\u0634\u06cc\",\"\u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647\"],\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/tutorials\\\/how-to-work-with-dates-and-times-in-sql\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/tutorials\\\/how-to-work-with-dates-and-times-in-sql\\\/\",\"url\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/tutorials\\\/how-to-work-with-dates-and-times-in-sql\\\/\",\"name\":\"\u0646\u062d\u0648\u0647 \u06a9\u0627\u0631 \u0628\u0627 \u062a\u0627\u0631\u06cc\u062e \u0648 \u0632\u0645\u0627\u0646 \u062f\u0631 SQL - \u0628\u0644\u0627\u06af ITPiran\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/tutorials\\\/how-to-work-with-dates-and-times-in-sql\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/tutorials\\\/how-to-work-with-dates-and-times-in-sql\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/cdn.itpiran.net\\\/2024\\\/07\\\/25111554\\\/SQL-1.jpg\",\"datePublished\":\"2024-07-25T08:40:56+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/tutorials\\\/how-to-work-with-dates-and-times-in-sql\\\/#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/tutorials\\\/how-to-work-with-dates-and-times-in-sql\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/tutorials\\\/how-to-work-with-dates-and-times-in-sql\\\/#primaryimage\",\"url\":\"https:\\\/\\\/cdn.itpiran.net\\\/2024\\\/07\\\/25111554\\\/SQL-1.jpg\",\"contentUrl\":\"https:\\\/\\\/cdn.itpiran.net\\\/2024\\\/07\\\/25111554\\\/SQL-1.jpg\",\"width\":1793,\"height\":1110},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/tutorials\\\/how-to-work-with-dates-and-times-in-sql\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"\u0622\u0645\u0648\u0632\u0634\u06cc\",\"item\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/category\\\/tutorials\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"\u0646\u062d\u0648\u0647 \u06a9\u0627\u0631 \u0628\u0627 \u062a\u0627\u0631\u06cc\u062e \u0648 \u0632\u0645\u0627\u0646 \u062f\u0631 SQL\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/#website\",\"url\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/\",\"name\":\"\u0628\u0644\u0627\u06af ITPiran\",\"description\":\"\u0627\u062e\u0628\u0627\u0631 \u0648 \u0645\u0642\u0627\u0644\u0627\u062a \u062a\u062c\u0627\u0631\u062a \u067e\u0627\u06cc\u062f\u0627\u0631 \u0627\u06cc\u0631\u0627\u0646\u06cc\u0627\u0646\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/#organization\",\"name\":\"\u0628\u0644\u0627\u06af \u062a\u062c\u0627\u0631\u062a \u067e\u0627\u06cc\u062f\u0627\u0631 \u0627\u06cc\u0631\u0627\u0646\u06cc\u0627\u0646\",\"alternateName\":\"ITPIran Blog\",\"url\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/cdn.itpiran.net\\\/2023\\\/12\\\/27150508\\\/cropped-ITPIRAN-BLOG-LOGO-2.png\",\"contentUrl\":\"https:\\\/\\\/cdn.itpiran.net\\\/2023\\\/12\\\/27150508\\\/cropped-ITPIRAN-BLOG-LOGO-2.png\",\"width\":512,\"height\":512,\"caption\":\"\u0628\u0644\u0627\u06af \u062a\u062c\u0627\u0631\u062a \u067e\u0627\u06cc\u062f\u0627\u0631 \u0627\u06cc\u0631\u0627\u0646\u06cc\u0627\u0646\"},\"image\":{\"@id\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/#\\\/schema\\\/logo\\\/image\\\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/#\\\/schema\\\/person\\\/04ed27b919baca468a2273f8e4318f81\",\"name\":\"admin\",\"url\":\"https:\\\/\\\/www.itpiran.net\\\/blog\\\/zh\\\/author\\\/admin\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"\u5982\u4f55\u5728 SQL \u4e2d\u5904\u7406\u65e5\u671f\u548c\u65f6\u95f4 - ITPiran \u535a\u5ba2","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.itpiran.net\/blog\/zh\/tutorials\/how-to-work-with-dates-and-times-in-sql\/","og_locale":"zh_CN","og_type":"article","og_title":"\u0646\u062d\u0648\u0647 \u06a9\u0627\u0631 \u0628\u0627 \u062a\u0627\u0631\u06cc\u062e \u0648 \u0632\u0645\u0627\u0646 \u062f\u0631 SQL - \u0628\u0644\u0627\u06af ITPiran","og_description":"\u0645\u0642\u062f\u0645\u0647 \u0647\u0646\u06af\u0627\u0645 \u06a9\u0627\u0631 \u0628\u0627 \u067e\u0627\u06cc\u06af\u0627\u0647 \u0647\u0627\u06cc \u062f\u0627\u062f\u0647 \u0631\u0627\u0628\u0637\u0647 \u0627\u06cc \u0648 \u0632\u0628\u0627\u0646 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0633\u0627\u062e\u062a\u0627\u0631\u06cc\u0627\u0641\u062a\u0647 (SQL)\u060c \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a&hellip;","og_url":"https:\/\/www.itpiran.net\/blog\/zh\/tutorials\/how-to-work-with-dates-and-times-in-sql\/","og_site_name":"\u0628\u0644\u0627\u06af ITPiran","article_published_time":"2024-07-25T08:40:56+00:00","og_image":[{"width":1793,"height":1110,"url":"https:\/\/cdn.itpiran.net\/2024\/07\/25111554\/SQL-1.jpg","type":"image\/jpeg"}],"author":"admin","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"admin","\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4":"5 \u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.itpiran.net\/blog\/tutorials\/how-to-work-with-dates-and-times-in-sql\/#article","isPartOf":{"@id":"https:\/\/www.itpiran.net\/blog\/tutorials\/how-to-work-with-dates-and-times-in-sql\/"},"author":{"name":"admin","@id":"https:\/\/www.itpiran.net\/blog\/#\/schema\/person\/04ed27b919baca468a2273f8e4318f81"},"headline":"\u0646\u062d\u0648\u0647 \u06a9\u0627\u0631 \u0628\u0627 \u062a\u0627\u0631\u06cc\u062e \u0648 \u0632\u0645\u0627\u0646 \u062f\u0631 SQL","datePublished":"2024-07-25T08:40:56+00:00","mainEntityOfPage":{"@id":"https:\/\/www.itpiran.net\/blog\/tutorials\/how-to-work-with-dates-and-times-in-sql\/"},"wordCount":182,"commentCount":0,"publisher":{"@id":"https:\/\/www.itpiran.net\/blog\/#organization"},"image":{"@id":"https:\/\/www.itpiran.net\/blog\/tutorials\/how-to-work-with-dates-and-times-in-sql\/#primaryimage"},"thumbnailUrl":"https:\/\/cdn.itpiran.net\/2024\/07\/25111554\/SQL-1.jpg","keywords":["data base","MySQL"],"articleSection":["\u0622\u0645\u0648\u0632\u0634\u06cc","\u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647"],"inLanguage":"zh-Hans","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.itpiran.net\/blog\/tutorials\/how-to-work-with-dates-and-times-in-sql\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.itpiran.net\/blog\/tutorials\/how-to-work-with-dates-and-times-in-sql\/","url":"https:\/\/www.itpiran.net\/blog\/tutorials\/how-to-work-with-dates-and-times-in-sql\/","name":"\u5982\u4f55\u5728 SQL \u4e2d\u5904\u7406\u65e5\u671f\u548c\u65f6\u95f4 - ITPiran \u535a\u5ba2","isPartOf":{"@id":"https:\/\/www.itpiran.net\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.itpiran.net\/blog\/tutorials\/how-to-work-with-dates-and-times-in-sql\/#primaryimage"},"image":{"@id":"https:\/\/www.itpiran.net\/blog\/tutorials\/how-to-work-with-dates-and-times-in-sql\/#primaryimage"},"thumbnailUrl":"https:\/\/cdn.itpiran.net\/2024\/07\/25111554\/SQL-1.jpg","datePublished":"2024-07-25T08:40:56+00:00","breadcrumb":{"@id":"https:\/\/www.itpiran.net\/blog\/tutorials\/how-to-work-with-dates-and-times-in-sql\/#breadcrumb"},"inLanguage":"zh-Hans","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.itpiran.net\/blog\/tutorials\/how-to-work-with-dates-and-times-in-sql\/"]}]},{"@type":"ImageObject","inLanguage":"zh-Hans","@id":"https:\/\/www.itpiran.net\/blog\/tutorials\/how-to-work-with-dates-and-times-in-sql\/#primaryimage","url":"https:\/\/cdn.itpiran.net\/2024\/07\/25111554\/SQL-1.jpg","contentUrl":"https:\/\/cdn.itpiran.net\/2024\/07\/25111554\/SQL-1.jpg","width":1793,"height":1110},{"@type":"BreadcrumbList","@id":"https:\/\/www.itpiran.net\/blog\/tutorials\/how-to-work-with-dates-and-times-in-sql\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.itpiran.net\/blog\/"},{"@type":"ListItem","position":2,"name":"\u0622\u0645\u0648\u0632\u0634\u06cc","item":"https:\/\/www.itpiran.net\/blog\/category\/tutorials\/"},{"@type":"ListItem","position":3,"name":"\u0646\u062d\u0648\u0647 \u06a9\u0627\u0631 \u0628\u0627 \u062a\u0627\u0631\u06cc\u062e \u0648 \u0632\u0645\u0627\u0646 \u062f\u0631 SQL"}]},{"@type":"WebSite","@id":"https:\/\/www.itpiran.net\/blog\/#website","url":"https:\/\/www.itpiran.net\/blog\/","name":"ITPiran\u535a\u5ba2","description":"\u4f0a\u6717\u53ef\u6301\u7eed\u8d38\u6613\u65b0\u95fb\u548c\u6587\u7ae0","publisher":{"@id":"https:\/\/www.itpiran.net\/blog\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.itpiran.net\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"zh-Hans"},{"@type":"Organization","@id":"https:\/\/www.itpiran.net\/blog\/#organization","name":"\u4f0a\u6717\u53ef\u6301\u7eed\u5546\u4e1a\u535a\u5ba2","alternateName":"ITPIran Blog","url":"https:\/\/www.itpiran.net\/blog\/","logo":{"@type":"ImageObject","inLanguage":"zh-Hans","@id":"https:\/\/www.itpiran.net\/blog\/#\/schema\/logo\/image\/","url":"https:\/\/cdn.itpiran.net\/2023\/12\/27150508\/cropped-ITPIRAN-BLOG-LOGO-2.png","contentUrl":"https:\/\/cdn.itpiran.net\/2023\/12\/27150508\/cropped-ITPIRAN-BLOG-LOGO-2.png","width":512,"height":512,"caption":"\u0628\u0644\u0627\u06af \u062a\u062c\u0627\u0631\u062a \u067e\u0627\u06cc\u062f\u0627\u0631 \u0627\u06cc\u0631\u0627\u0646\u06cc\u0627\u0646"},"image":{"@id":"https:\/\/www.itpiran.net\/blog\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/www.itpiran.net\/blog\/#\/schema\/person\/04ed27b919baca468a2273f8e4318f81","name":"\u884c\u653f","url":"https:\/\/www.itpiran.net\/blog\/zh\/author\/admin\/"}]}},"_links":{"self":[{"href":"https:\/\/www.itpiran.net\/blog\/zh\/wp-json\/wp\/v2\/posts\/15974","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.itpiran.net\/blog\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.itpiran.net\/blog\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.itpiran.net\/blog\/zh\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.itpiran.net\/blog\/zh\/wp-json\/wp\/v2\/comments?post=15974"}],"version-history":[{"count":3,"href":"https:\/\/www.itpiran.net\/blog\/zh\/wp-json\/wp\/v2\/posts\/15974\/revisions"}],"predecessor-version":[{"id":15978,"href":"https:\/\/www.itpiran.net\/blog\/zh\/wp-json\/wp\/v2\/posts\/15974\/revisions\/15978"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.itpiran.net\/blog\/zh\/wp-json\/wp\/v2\/media\/15975"}],"wp:attachment":[{"href":"https:\/\/www.itpiran.net\/blog\/zh\/wp-json\/wp\/v2\/media?parent=15974"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.itpiran.net\/blog\/zh\/wp-json\/wp\/v2\/categories?post=15974"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.itpiran.net\/blog\/zh\/wp-json\/wp\/v2\/tags?post=15974"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}