{"id":168503,"date":"2024-11-06T12:55:17","date_gmt":"2024-11-06T04:55:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/168503\/"},"modified":"2024-11-06T12:55:18","modified_gmt":"2024-11-06T04:55:18","slug":"sql-%e4%b8%ad-max-%e5%92%8c-min-%e5%87%bd%e6%95%b8%e7%9a%84%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/168503\/","title":{"rendered":"SQL \u4e2d MAX() \u548c MIN() \u51fd\u6578\u7684\u4f7f\u7528"},"content":{"rendered":"<h1 id=\"sql-%e4%b8%ad-max-%e5%92%8c-min-%e5%87%bd%e6%95%b8%e7%9a%84%e4%bd%bf%e7%94%a8-xJPueIlOuD\">SQL \u4e2d MAX() \u548c MIN() \u51fd\u6578\u7684\u4f7f\u7528<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u4e00\u7a2e\u7528\u65bc\u67e5\u8a62\u548c\u64cd\u4f5c\u8cc7\u6599\u7684\u6a19\u6e96\u8a9e\u8a00\u3002\u7576\u6211\u5011\u9700\u8981\u5f9e\u8cc7\u6599\u8868\u4e2d\u7372\u53d6\u7279\u5b9a\u6578\u64da\u6642\uff0cMAX() \u548c MIN() \u51fd\u6578\u662f\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\u3002\u9019\u5169\u500b\u51fd\u6578\u5206\u5225\u7528\u65bc\u67e5\u8a62\u67d0\u4e00\u5217\u4e2d\u7684\u6700\u5927\u503c\u548c\u6700\u5c0f\u503c\uff0c\u5e6b\u52a9\u7528\u6236\u5feb\u901f\u7372\u53d6\u6240\u9700\u7684\u6578\u64da\u3002<\/p>\n<h2 id=\"max-%e5%87%bd%e6%95%b8-xJPueIlOuD\">MAX() \u51fd\u6578<\/h2>\n<p>MAX() \u51fd\u6578\u7528\u65bc\u8fd4\u56de\u6307\u5b9a\u5217\u4e2d\u7684\u6700\u5927\u503c\u3002\u9019\u500b\u51fd\u6578\u901a\u5e38\u7528\u65bc\u6578\u5b57\u3001\u65e5\u671f\u6216\u5b57\u4e32\u985e\u578b\u7684\u6578\u64da\u3002\u4f7f\u7528 MAX() \u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\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\u8cc7\u6599\u8868\uff0c\u5176\u4e2d\u5305\u542b\u54e1\u5de5\u7684\u85aa\u6c34\u8cc7\u8a0a\u3002\u82e5\u8981\u67e5\u8a62\u6700\u9ad8\u85aa\u6c34\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT MAX(salary) FROM employees;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de <code>employees<\/code> \u8868\u4e2d\u6240\u6709\u54e1\u5de5\u7684\u6700\u9ad8\u85aa\u6c34\u3002<\/p>\n<h2 id=\"min-%e5%87%bd%e6%95%b8-xJPueIlOuD\">MIN() \u51fd\u6578<\/h2>\n<p>\u76f8\u5c0d\u65bc MAX() \u51fd\u6578\uff0cMIN() \u51fd\u6578\u7528\u65bc\u8fd4\u56de\u6307\u5b9a\u5217\u4e2d\u7684\u6700\u5c0f\u503c\u3002\u5176\u57fa\u672c\u8a9e\u6cd5\u8207 MAX() \u51fd\u6578\u76f8\u4f3c\uff1a<\/p>\n<pre><code>SELECT MIN(column_name) FROM table_name;<\/code><\/pre>\n<p>\u7e7c\u7e8c\u4f7f\u7528 <code>employees<\/code> \u8868\u7684\u4f8b\u5b50\uff0c\u82e5\u8981\u67e5\u8a62\u6700\u4f4e\u85aa\u6c34\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT MIN(salary) FROM employees;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de <code>employees<\/code> \u8868\u4e2d\u6240\u6709\u54e1\u5de5\u7684\u6700\u4f4e\u85aa\u6c34\u3002<\/p>\n<h2 id=\"%e7%b5%90%e5%90%88%e4%bd%bf%e7%94%a8-max-%e5%92%8c-min-%e5%87%bd%e6%95%b8-xJPueIlOuD\">\u7d50\u5408\u4f7f\u7528 MAX() \u548c MIN() \u51fd\u6578<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u53ef\u80fd\u9700\u8981\u540c\u6642\u7372\u53d6\u6700\u5927\u503c\u548c\u6700\u5c0f\u503c\u3002\u9019\u53ef\u4ee5\u901a\u904e\u5728\u540c\u4e00\u67e5\u8a62\u4e2d\u4f7f\u7528 MAX() \u548c MIN() \u51fd\u6578\u4f86\u5be6\u73fe\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT MAX(salary) AS Highest_Salary, MIN(salary) AS Lowest_Salary FROM employees;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u4e00\u884c\u7d50\u679c\uff0c\u5176\u4e2d\u5305\u542b\u6700\u9ad8\u85aa\u6c34\u548c\u6700\u4f4e\u85aa\u6c34\u7684\u503c\uff0c\u5206\u5225\u4ee5 <code>Highest_Salary<\/code> \u548c <code>Lowest_Salary<\/code> \u6a19\u7c64\u986f\u793a\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8-group-by-%e8%88%87-max-%e5%92%8c-min-%e5%87%bd%e6%95%b8-xJPueIlOuD\">\u4f7f\u7528 GROUP BY \u8207 MAX() \u548c MIN() \u51fd\u6578<\/h2>\n<p>\u5728\u9032\u884c\u5206\u7d44\u67e5\u8a62\u6642\uff0cMAX() \u548c MIN() \u51fd\u6578\u4e5f\u975e\u5e38\u6709\u7528\u3002\u7576\u6211\u5011\u9700\u8981\u6839\u64da\u67d0\u4e00\u5217\u7684\u503c\u9032\u884c\u5206\u7d44\u4e26\u7372\u53d6\u6bcf\u7d44\u7684\u6700\u5927\u6216\u6700\u5c0f\u503c\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>GROUP BY<\/code> \u5b50\u53e5\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u60f3\u8981\u67e5\u8a62\u6bcf\u500b\u90e8\u9580\u7684\u6700\u9ad8\u85aa\u6c34\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT department, MAX(salary) AS Highest_Salary FROM employees GROUP BY department;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6bcf\u500b\u90e8\u9580\u7684\u6700\u9ad8\u85aa\u6c34\uff0c\u4e26\u6839\u64da\u90e8\u9580\u9032\u884c\u5206\u7d44\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-xJPueIlOuD\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li>MAX() \u548c MIN() \u51fd\u6578\u53ea\u80fd\u7528\u65bc\u6578\u503c\u3001\u65e5\u671f\u6216\u5b57\u4e32\u985e\u578b\u7684\u5217\u3002<\/li>\n<li>\u5728\u4f7f\u7528\u9019\u4e9b\u51fd\u6578\u6642\uff0cNULL \u503c\u5c07\u88ab\u5ffd\u7565\u3002<\/li>\n<li>\u5728\u9032\u884c\u5206\u7d44\u67e5\u8a62\u6642\uff0c\u5fc5\u9808\u4f7f\u7528 <code>GROUP BY<\/code> \u5b50\u53e5\u4f86\u6307\u5b9a\u5206\u7d44\u7684\u5217\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-xJPueIlOuD\">\u7e3d\u7d50<\/h2>\n<p>MAX() \u548c MIN() \u51fd\u6578\u662f SQL \u4e2d\u975e\u5e38\u91cd\u8981\u7684\u805a\u5408\u51fd\u6578\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5feb\u901f\u7372\u53d6\u8cc7\u6599\u8868\u4e2d\u7684\u6700\u5927\u503c\u548c\u6700\u5c0f\u503c\u3002\u7121\u8ad6\u662f\u5728\u7c21\u55ae\u67e5\u8a62\u9084\u662f\u8907\u96dc\u7684\u5206\u7d44\u67e5\u8a62\u4e2d\uff0c\u9019\u4e9b\u51fd\u6578\u90fd\u80fd\u63d0\u4f9b\u6709\u50f9\u503c\u7684\u6578\u64da\u5206\u6790\u529f\u80fd\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u7528\u6236\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u65b9\u6848\u53ef\u4ee5\u9032\u4e00\u6b65\u63d0\u5347\u8cc7\u6599\u5eab\u7684\u6027\u80fd\u548c\u7a69\u5b9a\u6027\uff0c\u8b93\u6578\u64da\u67e5\u8a62\u66f4\u52a0\u6d41\u66a2\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3 SQL \u4e2d MAX() \u548c MIN() \u51fd\u6578\u7684\u4f7f\u7528\u65b9\u6cd5\uff0c\u8f15\u9b06\u7372\u53d6\u6578\u64da\u96c6\u4e2d\u7684\u6700\u5927\u503c\u548c\u6700\u5c0f\u503c\uff0c\u63d0\u5347\u6578\u64da\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-168503","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168503","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=168503"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168503\/revisions"}],"predecessor-version":[{"id":168504,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168503\/revisions\/168504"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=168503"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=168503"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=168503"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}