{"id":168393,"date":"2024-11-06T12:00:20","date_gmt":"2024-11-06T04:00:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/168393\/"},"modified":"2024-11-06T12:00:21","modified_gmt":"2024-11-06T04:00:21","slug":"sql-%e6%a2%9d%e4%bb%b6%e8%aa%9e%e5%8f%a5%e5%af%a6%e4%be%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/168393\/","title":{"rendered":"SQL \u689d\u4ef6\u8a9e\u53e5\u5be6\u4f8b"},"content":{"rendered":"<h1 id=\"sql-%e6%a2%9d%e4%bb%b6%e8%aa%9e%e5%8f%a5%e5%af%a6%e4%be%8b-LQdcCWKPSa\">SQL \u689d\u4ef6\u8a9e\u53e5\u5be6\u4f8b<\/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\u689d\u4ef6\u8a9e\u53e5\u662f SQL \u4e2d\u975e\u5e38\u91cd\u8981\u7684\u4e00\u90e8\u5206\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u6839\u64da\u7279\u5b9a\u689d\u4ef6\u7be9\u9078\u8cc7\u6599\u3002\u672c\u6587\u5c07\u4ecb\u7d39 SQL \u689d\u4ef6\u8a9e\u53e5\u7684\u57fa\u672c\u6982\u5ff5\u53ca\u5176\u5be6\u4f8b\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u5982\u4f55\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u4f7f\u7528\u9019\u4e9b\u8a9e\u53e5\u3002<\/p>\n<h2 id=\"sql-%e6%a2%9d%e4%bb%b6%e8%aa%9e%e5%8f%a5%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-LQdcCWKPSa\">SQL \u689d\u4ef6\u8a9e\u53e5\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>SQL \u4e2d\u7684\u689d\u4ef6\u8a9e\u53e5\u4e3b\u8981\u7528\u65bc <code>SELECT<\/code>\u3001<code>UPDATE<\/code>\u3001<code>DELETE<\/code> \u7b49\u64cd\u4f5c\u4e2d\uff0c\u6700\u5e38\u898b\u7684\u689d\u4ef6\u8a9e\u53e5\u662f <code>WHERE<\/code> \u5b50\u53e5\u3002<code>WHERE<\/code> \u5b50\u53e5\u5141\u8a31\u7528\u6236\u6307\u5b9a\u7be9\u9078\u689d\u4ef6\uff0c\u5f9e\u800c\u7372\u53d6\u7b26\u5408\u689d\u4ef6\u7684\u8cc7\u6599\u3002<\/p>\n<h2 id=\"%e5%b8%b8%e8%a6%8b%e7%9a%84-sql-%e6%a2%9d%e4%bb%b6%e8%aa%9e%e5%8f%a5-LQdcCWKPSa\">\u5e38\u898b\u7684 SQL \u689d\u4ef6\u8a9e\u53e5<\/h2>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8-where-%e5%ad%90%e5%8f%a5-LQdcCWKPSa\">1. \u4f7f\u7528 WHERE \u5b50\u53e5<\/h3>\n<p>\u6700\u57fa\u672c\u7684\u689d\u4ef6\u8a9e\u53e5\u662f\u4f7f\u7528 <code>WHERE<\/code> \u5b50\u53e5\u4f86\u7be9\u9078\u8cc7\u6599\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>employees<\/code> \u7684\u8868\u683c\uff0c\u5305\u542b\u54e1\u5de5\u7684\u8cc7\u6599\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\u4f86\u67e5\u8a62\u6240\u6709\u5e74\u9f61\u5927\u65bc 30 \u6b72\u7684\u54e1\u5de5\uff1a<\/p>\n<pre><code>SELECT * FROM employees WHERE age &gt; 30;<\/code><\/pre>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8-and-%e5%92%8c-or-LQdcCWKPSa\">2. \u4f7f\u7528 AND \u548c OR<\/h3>\n<p>\u5728 SQL \u4e2d\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 <code>AND<\/code> \u548c <code>OR<\/code> \u4f86\u7d44\u5408\u591a\u500b\u689d\u4ef6\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u60f3\u67e5\u8a62\u5e74\u9f61\u5927\u65bc 30 \u6b72\u4e14\u90e8\u9580\u70ba\u300c\u92b7\u552e\u300d\u7684\u54e1\u5de5\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT * FROM employees WHERE age &gt; 30 AND department = 'Sales';<\/code><\/pre>\n<p>\u76f8\u53cd\uff0c\u5982\u679c\u6211\u5011\u60f3\u67e5\u8a62\u5e74\u9f61\u5c0f\u65bc 25 \u6b72\u6216\u90e8\u9580\u70ba\u300c\u5e02\u5834\u300d\u7684\u54e1\u5de5\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n<pre><code>SELECT * FROM employees WHERE age &lt; 25 OR department = 'Marketing';<\/code><\/pre>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8-in-%e5%92%8c-between-LQdcCWKPSa\">3. \u4f7f\u7528 IN \u548c BETWEEN<\/h3>\n<p>\u5728 SQL \u4e2d\uff0c<code>IN<\/code> \u548c <code>BETWEEN<\/code> \u4e5f\u662f\u5e38\u7528\u7684\u689d\u4ef6\u8a9e\u53e5\u3002<code>IN<\/code> \u7528\u65bc\u6307\u5b9a\u591a\u500b\u53ef\u80fd\u7684\u503c\uff0c\u800c <code>BETWEEN<\/code> \u7528\u65bc\u7bc4\u570d\u67e5\u8a62\u3002\u4f8b\u5982\uff0c\u67e5\u8a62\u90e8\u9580\u70ba\u300c\u92b7\u552e\u300d\u6216\u300c\u5e02\u5834\u300d\u7684\u54e1\u5de5\uff1a<\/p>\n<pre><code>SELECT * FROM employees WHERE department IN ('Sales', 'Marketing');<\/code><\/pre>\n<p>\u800c\u67e5\u8a62\u5e74\u9f61\u5728 25 \u5230 35 \u6b72\u4e4b\u9593\u7684\u54e1\u5de5\uff1a<\/p>\n<pre><code>SELECT * FROM employees WHERE age BETWEEN 25 AND 35;<\/code><\/pre>\n<h3 id=\"4-%e4%bd%bf%e7%94%a8-like-%e9%80%b2%e8%a1%8c%e6%a8%a1%e7%b3%8a%e6%9f%a5%e8%a9%a2-LQdcCWKPSa\">4. \u4f7f\u7528 LIKE \u9032\u884c\u6a21\u7cca\u67e5\u8a62<\/h3>\n<p>\u5982\u679c\u9700\u8981\u9032\u884c\u6a21\u7cca\u67e5\u8a62\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>LIKE<\/code> \u95dc\u9375\u5b57\u3002\u4f8b\u5982\uff0c\u67e5\u8a62\u6240\u6709\u540d\u5b57\u4ee5\u300cJ\u300d\u958b\u982d\u7684\u54e1\u5de5\uff1a<\/p>\n<pre><code>SELECT * FROM employees WHERE name LIKE 'J%';<\/code><\/pre>\n<p>\u9019\u88e1\u7684\u300c%\u300d\u8868\u793a\u4efb\u610f\u6578\u91cf\u7684\u5b57\u7b26\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-LQdcCWKPSa\">\u7e3d\u7d50<\/h2>\n<p>SQL \u7684\u689d\u4ef6\u8a9e\u53e5\u662f\u8cc7\u6599\u67e5\u8a62\u548c\u64cd\u4f5c\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\uff0c\u901a\u904e\u4f7f\u7528 <code>WHERE<\/code>\u3001<code>AND<\/code>\u3001<code>OR<\/code>\u3001<code>IN<\/code>\u3001<code>BETWEEN<\/code> \u548c <code>LIKE<\/code> \u7b49\u95dc\u9375\u5b57\uff0c\u7528\u6236\u53ef\u4ee5\u9748\u6d3b\u5730\u7be9\u9078\u6240\u9700\u7684\u8cc7\u6599\u3002\u638c\u63e1\u9019\u4e9b\u57fa\u672c\u7684 SQL \u689d\u4ef6\u8a9e\u53e5\uff0c\u5c07\u6709\u52a9\u65bc\u63d0\u9ad8\u8cc7\u6599\u5eab\u64cd\u4f5c\u7684\u6548\u7387\u548c\u6e96\u78ba\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u8cc7\u6599\u5eab\u7ba1\u7406\u6216\u9700\u8981\u66f4\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\u611f\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 SQL \u689d\u4ef6\u8a9e\u53e5\u7684\u5be6\u4f8b\uff0c\u5b78\u7fd2\u5982\u4f55\u6709\u6548\u5730\u904e\u6ffe\u548c\u67e5\u8a62\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u5eab\u64cd\u4f5c\u6280\u80fd\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-168393","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168393","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=168393"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168393\/revisions"}],"predecessor-version":[{"id":168394,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168393\/revisions\/168394"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=168393"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=168393"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=168393"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}