{"id":141945,"date":"2024-10-31T22:13:29","date_gmt":"2024-10-31T14:13:29","guid":{"rendered":"https:\/\/server.hk\/cnblog\/141945\/"},"modified":"2024-10-31T22:13:29","modified_gmt":"2024-10-31T14:13:29","slug":"sql-where-%e5%ad%90%e5%8f%a5%e7%b0%a1%e4%bb%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/141945\/","title":{"rendered":"SQL WHERE \u5b50\u53e5\u7c21\u4ecb"},"content":{"rendered":"<h1 id=\"sql-where-%e5%ad%90%e5%8f%a5%e7%b0%a1%e4%bb%8b-EwPZAnsSkC\">SQL WHERE \u5b50\u53e5\u7c21\u4ecb<\/h1>\n<p>\u5728 SQL \u4e2d\uff0cWHERE \u5b50\u53e5\u662f\u4e00\u500b\u975e\u5e38\u91cd\u8981\u7684\u7d44\u4ef6\uff0c\u4e3b\u8981\u7528\u65bc\u904e\u6ffe\u67e5\u8a62\u7d50\u679c\u3002\u5b83\u5141\u8a31\u7528\u6236\u6307\u5b9a\u689d\u4ef6\uff0c\u4ee5\u4fbf\u5f9e\u8cc7\u6599\u5eab\u4e2d\u6aa2\u7d22\u7b26\u5408\u7279\u5b9a\u6a19\u6e96\u7684\u6578\u64da\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u6df1\u5165\u63a2\u8a0e SQL WHERE \u5b50\u53e5\u7684\u57fa\u672c\u6982\u5ff5\u3001\u8a9e\u6cd5\u3001\u4f7f\u7528\u7bc4\u4f8b\u4ee5\u53ca\u4e00\u4e9b\u5e38\u898b\u7684\u61c9\u7528\u5834\u666f\u3002<\/p>\n<h2 id=\"where-%e5%ad%90%e5%8f%a5%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-EwPZAnsSkC\">WHERE \u5b50\u53e5\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>WHERE \u5b50\u53e5\u901a\u5e38\u8207 SELECT\u3001UPDATE \u548c DELETE \u8a9e\u53e5\u4e00\u8d77\u4f7f\u7528\u3002\u5b83\u7684\u4e3b\u8981\u529f\u80fd\u662f\u9650\u5236\u67e5\u8a62\u7d50\u679c\u96c6\u4e2d\u7684\u884c\u6578\uff0c\u50c5\u8fd4\u56de\u7b26\u5408\u6307\u5b9a\u689d\u4ef6\u7684\u884c\u3002\u9019\u5c0d\u65bc\u8655\u7406\u5927\u578b\u8cc7\u6599\u96c6\u6642\u7279\u5225\u6709\u7528\uff0c\u56e0\u70ba\u5b83\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/p>\n<h2 id=\"where-%e5%ad%90%e5%8f%a5%e7%9a%84%e8%aa%9e%e6%b3%95-EwPZAnsSkC\">WHERE \u5b50\u53e5\u7684\u8a9e\u6cd5<\/h2>\n<p>WHERE \u5b50\u53e5\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT column1, column2, ...\nFROM table_name\nWHERE condition;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>condition<\/code> \u662f\u4e00\u500b\u8868\u9054\u5f0f\uff0c\u7528\u65bc\u6307\u5b9a\u8981\u904e\u6ffe\u7684\u689d\u4ef6\u3002\u9019\u4e9b\u689d\u4ef6\u53ef\u4ee5\u662f\u6bd4\u8f03\u904b\u7b97\u7b26\uff08\u5982 =\u3001&lt;\u3001&gt;\u3001&lt;=\u3001&gt;=\uff09\u6216\u908f\u8f2f\u904b\u7b97\u7b26\uff08\u5982 AND\u3001OR\u3001NOT\uff09\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-EwPZAnsSkC\">\u4f7f\u7528\u7bc4\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528 WHERE \u5b50\u53e5\u7684\u7bc4\u4f8b\uff1a<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b-1%ef%bc%9a%e5%9f%ba%e6%9c%ac%e6%9f%a5%e8%a9%a2-EwPZAnsSkC\">\u7bc4\u4f8b 1\uff1a\u57fa\u672c\u67e5\u8a62<\/h3>\n<pre><code>SELECT * \nFROM Employees\nWHERE Department = 'Sales';<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5728\u300cSales\u300d\u90e8\u9580\u5de5\u4f5c\u7684\u54e1\u5de5\u7684\u8cc7\u6599\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b-2%ef%bc%9a%e4%bd%bf%e7%94%a8%e6%af%94%e8%bc%83%e9%81%8b%e7%ae%97%e7%ac%a6-EwPZAnsSkC\">\u7bc4\u4f8b 2\uff1a\u4f7f\u7528\u6bd4\u8f03\u904b\u7b97\u7b26<\/h3>\n<pre><code>SELECT * \nFROM Products\nWHERE Price &gt; 100;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u50f9\u683c\u9ad8\u65bc 100 \u7684\u7522\u54c1\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b-3%ef%bc%9a%e4%bd%bf%e7%94%a8%e9%82%8f%e8%bc%af%e9%81%8b%e7%ae%97%e7%ac%a6-EwPZAnsSkC\">\u7bc4\u4f8b 3\uff1a\u4f7f\u7528\u908f\u8f2f\u904b\u7b97\u7b26<\/h3>\n<pre><code>SELECT * \nFROM Orders\nWHERE OrderDate &gt; '2023-01-01' AND Status = 'Shipped';<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5728 2023 \u5e74 1 \u6708 1 \u65e5\u4e4b\u5f8c\u4e14\u72c0\u614b\u70ba\u300c\u5df2\u767c\u8ca8\u300d\u7684\u8a02\u55ae\u3002<\/p>\n<h2 id=\"%e5%b8%b8%e8%a6%8b%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-EwPZAnsSkC\">\u5e38\u898b\u7684\u61c9\u7528\u5834\u666f<\/h2>\n<p>WHERE \u5b50\u53e5\u5728\u8a31\u591a\u5834\u666f\u4e2d\u90fd\u975e\u5e38\u6709\u7528\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u61c9\u7528\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u7be9\u9078\uff1a<\/strong>\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528 WHERE \u5b50\u53e5\u53ef\u4ee5\u6709\u6548\u5730\u7be9\u9078\u51fa\u6240\u9700\u7684\u6578\u64da\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u8655\u7406\u3002<\/li>\n<li><strong>\u6578\u64da\u66f4\u65b0\uff1a<\/strong>\u5728 UPDATE \u8a9e\u53e5\u4e2d\uff0cWHERE \u5b50\u53e5\u53ef\u4ee5\u78ba\u4fdd\u53ea\u6709\u7b26\u5408\u689d\u4ef6\u7684\u884c\u6703\u88ab\u66f4\u65b0\u3002<\/li>\n<li><strong>\u6578\u64da\u522a\u9664\uff1a<\/strong>\u5728 DELETE \u8a9e\u53e5\u4e2d\uff0cWHERE \u5b50\u53e5\u53ef\u4ee5\u9632\u6b62\u610f\u5916\u522a\u9664\u6574\u500b\u8868\u4e2d\u7684\u6578\u64da\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-EwPZAnsSkC\">\u7d50\u8ad6<\/h2>\n<p>SQL WHERE \u5b50\u53e5\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u7cbe\u78ba\u5730\u63a7\u5236\u67e5\u8a62\u7d50\u679c\u3002\u7121\u8ad6\u662f\u5728\u6578\u64da\u6aa2\u7d22\u3001\u66f4\u65b0\u9084\u662f\u522a\u9664\u64cd\u4f5c\u4e2d\uff0c\u6b63\u78ba\u4f7f\u7528 WHERE \u5b50\u53e5\u90fd\u80fd\u63d0\u9ad8\u6548\u7387\u4e26\u78ba\u4fdd\u6578\u64da\u7684\u6e96\u78ba\u6027\u3002\u5c0d\u65bc\u5e0c\u671b\u6df1\u5165\u4e86\u89e3 SQL \u7684\u958b\u767c\u8005\u4f86\u8aaa\uff0c\u638c\u63e1 WHERE \u5b50\u53e5\u7684\u4f7f\u7528\u662f\u975e\u5e38\u91cd\u8981\u7684\u4e00\u6b65\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728 <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u74b0\u5883\u4e2d\u4f7f\u7528 SQL \u6709\u9032\u4e00\u6b65\u7684\u8208\u8da3\uff0c\u6216\u60f3\u4e86\u89e3\u66f4\u591a\u95dc\u65bc <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a> \u7684\u8cc7\u8a0a\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u6e90\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3SQL WHERE\u5b50\u53e5\u7684\u57fa\u672c\u7528\u6cd5\uff0c\u5b78\u7fd2\u5982\u4f55\u904e\u6ffe\u67e5\u8a62\u7d50\u679c\u4ee5\u7372\u53d6\u7279\u5b9a\u6578\u64da\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-141945","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/141945","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=141945"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/141945\/revisions"}],"predecessor-version":[{"id":141946,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/141945\/revisions\/141946"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=141945"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=141945"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=141945"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}