{"id":162937,"date":"2024-11-04T19:16:18","date_gmt":"2024-11-04T11:16:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/162937\/"},"modified":"2024-11-04T19:16:19","modified_gmt":"2024-11-04T11:16:19","slug":"%e6%95%99%e6%82%a8%e5%a6%82%e4%bd%95%e5%af%a6%e7%8f%bemysql%e6%9f%a5%e8%a9%a2%e6%9c%80%e5%a4%a7%e5%80%bc%e5%ad%97%e6%ae%b5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/162937\/","title":{"rendered":"\u6559\u60a8\u5982\u4f55\u5be6\u73feMySQL\u67e5\u8a62\u6700\u5927\u503c\u5b57\u6bb5"},"content":{"rendered":"<h1 id=\"%e6%95%99%e6%82%a8%e5%a6%82%e4%bd%95%e5%af%a6%e7%8f%bemysql%e6%9f%a5%e8%a9%a2%e6%9c%80%e5%a4%a7%e5%80%bc%e5%ad%97%e6%ae%b5-SfifAyMDLa\">\u6559\u60a8\u5982\u4f55\u5be6\u73feMySQL\u67e5\u8a62\u6700\u5927\u503c\u5b57\u6bb5<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u67e5\u8a62\u6700\u5927\u503c\u5b57\u6bb5\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\uff0c\u5c24\u5176\u662f\u5728\u9700\u8981\u5206\u6790\u6578\u64da\u6216\u751f\u6210\u5831\u544a\u6642\u3002MySQL\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u5be6\u73fe\u9019\u4e00\u529f\u80fd\uff0c\u672c\u6587\u5c07\u8a73\u7d30\u4ecb\u7d39\u5982\u4f55\u4f7f\u7528SQL\u8a9e\u53e5\u4f86\u67e5\u8a62\u6700\u5927\u503c\u5b57\u6bb5\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u7bc4\u4f8b\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8max%e5%87%bd%e6%95%b8%e6%9f%a5%e8%a9%a2%e6%9c%80%e5%a4%a7%e5%80%bc-SfifAyMDLa\">\u4f7f\u7528MAX()\u51fd\u6578\u67e5\u8a62\u6700\u5927\u503c<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u6700\u5e38\u7528\u7684\u65b9\u6cd5\u662f\u4f7f\u7528\u5167\u5efa\u7684 <code>MAX()<\/code> \u51fd\u6578\u3002\u9019\u500b\u51fd\u6578\u53ef\u4ee5\u7528\u4f86\u67e5\u8a62\u67d0\u500b\u5b57\u6bb5\u7684\u6700\u5927\u503c\u3002\u4ee5\u4e0b\u662f\u57fa\u672c\u7684\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>SELECT MAX(column_name) FROM table_name;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>employees<\/code> \u7684\u8868\u683c\uff0c\u5176\u4e2d\u5305\u542b\u54e1\u5de5\u7684\u85aa\u8cc7\u4fe1\u606f\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\u4f86\u7372\u53d6\u6700\u9ad8\u85aa\u8cc7\uff1a<\/p>\n<pre><code>SELECT MAX(salary) FROM employees;<\/code><\/pre>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e6%9c%80%e5%a4%a7%e5%80%bc%e5%8f%8a%e5%85%b6%e5%b0%8d%e6%87%89%e7%9a%84%e5%85%b6%e4%bb%96%e5%ad%97%e6%ae%b5-SfifAyMDLa\">\u67e5\u8a62\u6700\u5927\u503c\u53ca\u5176\u5c0d\u61c9\u7684\u5176\u4ed6\u5b57\u6bb5<\/h2>\n<p>\u6709\u6642\u5019\uff0c\u6211\u5011\u4e0d\u50c5\u9700\u8981\u6700\u5927\u503c\uff0c\u9084\u5e0c\u671b\u7372\u53d6\u8207\u8a72\u6700\u5927\u503c\u76f8\u95dc\u7684\u5176\u4ed6\u5b57\u6bb5\u4fe1\u606f\u3002\u9019\u53ef\u4ee5\u901a\u904e\u5b50\u67e5\u8a62\u4f86\u5be6\u73fe\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>SELECT * FROM employees WHERE salary = (SELECT MAX(salary) FROM employees);<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u85aa\u8cc7\u6700\u9ad8\u7684\u54e1\u5de5\u7684\u6240\u6709\u4fe1\u606f\u3002\u5982\u679c\u6709\u591a\u4f4d\u54e1\u5de5\u7684\u85aa\u8cc7\u76f8\u540c\u4e14\u70ba\u6700\u9ad8\u503c\uff0c\u5247\u6703\u8fd4\u56de\u6240\u6709\u9019\u4e9b\u54e1\u5de5\u7684\u8cc7\u6599\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8group-by%e5%92%8cmax%e5%87%bd%e6%95%b8-SfifAyMDLa\">\u4f7f\u7528GROUP BY\u548cMAX()\u51fd\u6578<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u53ef\u80fd\u9700\u8981\u6309\u67d0\u500b\u5b57\u6bb5\u5206\u7d44\u4e26\u67e5\u8a62\u6bcf\u7d44\u7684\u6700\u5927\u503c\u3002\u9019\u6642\u53ef\u4ee5\u7d50\u5408\u4f7f\u7528 <code>GROUP BY<\/code> \u548c <code>MAX()<\/code> \u51fd\u6578\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT department, MAX(salary) FROM employees GROUP BY department;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6bcf\u500b\u90e8\u9580\u7684\u6700\u9ad8\u85aa\u8cc7\uff0c\u4e26\u986f\u793a\u8a72\u85aa\u8cc7\u6240\u5c6c\u7684\u90e8\u9580\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8order-by%e5%92%8climit%e6%9f%a5%e8%a9%a2%e6%9c%80%e5%a4%a7%e5%80%bc-SfifAyMDLa\">\u4f7f\u7528ORDER BY\u548cLIMIT\u67e5\u8a62\u6700\u5927\u503c<\/h2>\n<p>\u53e6\u4e00\u7a2e\u67e5\u8a62\u6700\u5927\u503c\u7684\u65b9\u6cd5\u662f\u4f7f\u7528 <code>ORDER BY<\/code> \u548c <code>LIMIT<\/code> \u5b50\u53e5\u3002\u9019\u7a2e\u65b9\u6cd5\u53ef\u4ee5\u7528\u4f86\u7372\u53d6\u6392\u5e8f\u5f8c\u7684\u7b2c\u4e00\u689d\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT * FROM employees ORDER BY salary DESC LIMIT 1;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u85aa\u8cc7\u6700\u9ad8\u7684\u54e1\u5de5\u7684\u6240\u6709\u4fe1\u606f\uff0c\u8207\u524d\u9762\u7684\u5b50\u67e5\u8a62\u65b9\u6cd5\u985e\u4f3c\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u53ef\u80fd\u6703\u66f4\u9ad8\u6548\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-SfifAyMDLa\">\u7d50\u8ad6<\/h2>\n<p>\u5728MySQL\u4e2d\u67e5\u8a62\u6700\u5927\u503c\u5b57\u6bb5\u662f\u4e00\u500b\u975e\u5e38\u5be6\u7528\u7684\u6280\u80fd\uff0c\u7121\u8ad6\u662f\u4f7f\u7528 <code>MAX()<\/code> \u51fd\u6578\u3001\u5b50\u67e5\u8a62\uff0c\u9084\u662f\u7d50\u5408 <code>GROUP BY<\/code> \u548c <code>ORDER BY<\/code>\uff0c\u90fd\u80fd\u6709\u6548\u5730\u7372\u53d6\u6240\u9700\u7684\u6578\u64da\u3002\u638c\u63e1\u9019\u4e9b\u67e5\u8a62\u6280\u5de7\uff0c\u5c07\u6709\u52a9\u65bc\u60a8\u5728\u6578\u64da\u5206\u6790\u548c\u5831\u544a\u751f\u6210\u4e2d\u66f4\u52a0\u5f97\u5fc3\u61c9\u624b\u3002<\/p>\n<p>\u5982\u679c\u60a8\u9700\u8981\u7a69\u5b9a\u7684\u6578\u64da\u5eab\u652f\u6301\uff0c\u8003\u616e\u4f7f\u7528 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u670d\u52d9\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u61c9\u7528\u63d0\u4f9b\u5f37\u5927\u7684\u5f8c\u7aef\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728MySQL\u4e2d\u67e5\u8a62\u6700\u5927\u503c\u5b57\u6bb5\uff0c\u638c\u63e1\u4f7f\u7528MAX()\u51fd\u6578\u7684\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u5eab\u67e5\u8a62\u6548\u7387\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-162937","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162937","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=162937"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162937\/revisions"}],"predecessor-version":[{"id":162938,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162937\/revisions\/162938"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=162937"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=162937"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=162937"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}