{"id":159999,"date":"2024-11-03T19:26:20","date_gmt":"2024-11-03T11:26:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/159999\/"},"modified":"2024-11-03T19:26:21","modified_gmt":"2024-11-03T11:26:21","slug":"mssql-%e6%95%99%e7%a8%8b-sql-where-%e5%ad%90%e5%8f%a5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/159999\/","title":{"rendered":"MSSQL \u6559\u7a0b SQL WHERE \u5b50\u53e5"},"content":{"rendered":"<h1 id=\"mssql-%e6%95%99%e7%a8%8b-sql-where-%e5%ad%90%e5%8f%a5-epefclwnUj\">MSSQL \u6559\u7a0b SQL WHERE \u5b50\u53e5<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u67e5\u8a62\u4e2d\uff0cSQL \u7684 WHERE \u5b50\u53e5\u662f\u4e00\u500b\u975e\u5e38\u91cd\u8981\u7684\u7d44\u4ef6\u3002\u5b83\u7528\u65bc\u904e\u6ffe\u67e5\u8a62\u7d50\u679c\uff0c\u78ba\u4fdd\u53ea\u8fd4\u56de\u7b26\u5408\u7279\u5b9a\u689d\u4ef6\u7684\u6578\u64da\u3002\u5728 Microsoft SQL Server\uff08MSSQL\uff09\u4e2d\uff0cWHERE \u5b50\u53e5\u7684\u4f7f\u7528\u65b9\u5f0f\u8207\u5176\u4ed6 SQL \u6578\u64da\u5eab\u7cfb\u7d71\u76f8\u4f3c\uff0c\u4f46\u4e5f\u6709\u5176\u7368\u7279\u4e4b\u8655\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e MSSQL \u4e2d\u7684 WHERE \u5b50\u53e5\uff0c\u5305\u62ec\u5176\u8a9e\u6cd5\u3001\u4f7f\u7528\u7bc4\u4f8b\u53ca\u6700\u4f73\u5be6\u8e10\u3002<\/p>\n<h2 id=\"where-%e5%ad%90%e5%8f%a5%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-epefclwnUj\">WHERE \u5b50\u53e5\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>WHERE \u5b50\u53e5\u901a\u5e38\u8207 SELECT\u3001UPDATE \u6216 DELETE \u8a9e\u53e5\u4e00\u8d77\u4f7f\u7528\u3002\u5176\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\u53ea\u6709\u6eff\u8db3\u8a72\u689d\u4ef6\u7684\u8a18\u9304\u624d\u6703\u88ab\u8fd4\u56de\u6216\u5f71\u97ff\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8-where-%e5%ad%90%e5%8f%a5%e7%9a%84%e7%af%84%e4%be%8b-epefclwnUj\">\u4f7f\u7528 WHERE \u5b50\u53e5\u7684\u7bc4\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528 WHERE \u5b50\u53e5\u7684\u7bc4\u4f8b\uff1a<\/p>\n<h3 id=\"1-%e5%9f%ba%e6%9c%ac%e6%9f%a5%e8%a9%a2-epefclwnUj\">1. \u57fa\u672c\u67e5\u8a62<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>Employees<\/code> \u7684\u8868\u683c\uff0c\u5305\u542b\u54e1\u5de5\u7684\u59d3\u540d\u548c\u5e74\u9f61\u3002\u6211\u5011\u60f3\u67e5\u8a62\u5e74\u9f61\u5927\u65bc 30 \u6b72\u7684\u54e1\u5de5\uff1a<\/p>\n<pre><code>SELECT Name, Age\nFROM Employees\nWHERE Age &gt; 30;<\/code><\/pre>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8-and-%e5%92%8c-or-epefclwnUj\">2. \u4f7f\u7528 AND \u548c OR<\/h3>\n<p>\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 <code>AND<\/code> \u548c <code>OR<\/code> \u4f86\u7d44\u5408\u591a\u500b\u689d\u4ef6\u3002\u4f8b\u5982\uff0c\u67e5\u8a62\u5e74\u9f61\u5927\u65bc 30 \u6b72\u4e14\u90e8\u9580\u70ba &#8216;Sales&#8217; \u7684\u54e1\u5de5\uff1a<\/p>\n<pre><code>SELECT Name, Age, Department\nFROM Employees\nWHERE Age &gt; 30 AND Department = 'Sales';<\/code><\/pre>\n<p>\u540c\u6a23\u5730\uff0c\u5982\u679c\u6211\u5011\u60f3\u67e5\u8a62\u5e74\u9f61\u5c0f\u65bc 25 \u6b72\u6216\u90e8\u9580\u70ba &#8216;HR&#8217; \u7684\u54e1\u5de5\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>SELECT Name, Age, Department\nFROM Employees\nWHERE Age &lt; 25 OR Department = 'HR';<\/code><\/pre>\n<h3 id=\"3-%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-epefclwnUj\">3. \u4f7f\u7528 LIKE \u9032\u884c\u6a21\u7cca\u67e5\u8a62<\/h3>\n<p>\u5982\u679c\u6211\u5011\u60f3\u67e5\u8a62\u59d3\u540d\u4e2d\u5305\u542b &#8216;John&#8217; \u7684\u6240\u6709\u54e1\u5de5\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>LIKE<\/code> \u95dc\u9375\u5b57\uff1a<\/p>\n<pre><code>SELECT Name, Age\nFROM Employees\nWHERE Name LIKE '%John%';<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>%<\/code> \u662f\u901a\u914d\u7b26\uff0c\u8868\u793a\u4efb\u610f\u6578\u91cf\u7684\u5b57\u7b26\u3002<\/p>\n<h2 id=\"%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-epefclwnUj\">\u6700\u4f73\u5be6\u8e10<\/h2>\n<p>\u5728\u4f7f\u7528 WHERE \u5b50\u53e5\u6642\uff0c\u6709\u5e7e\u500b\u6700\u4f73\u5be6\u8e10\u53ef\u4ee5\u9075\u5faa\uff1a<\/p>\n<ul>\n<li><strong>\u4f7f\u7528\u7d22\u5f15\uff1a<\/strong>\u78ba\u4fdd\u5728 WHERE \u5b50\u53e5\u4e2d\u4f7f\u7528\u7684\u5217\u4e0a\u6709\u7d22\u5f15\uff0c\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/li>\n<li><strong>\u907f\u514d\u4f7f\u7528\u51fd\u6578\uff1a<\/strong>\u5728 WHERE \u5b50\u53e5\u4e2d\u4f7f\u7528\u51fd\u6578\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\uff0c\u56e0\u70ba\u9019\u6a23\u6703\u4f7f\u7d22\u5f15\u7121\u6548\u3002<\/li>\n<li><strong>\u4f7f\u7528\u9069\u7576\u7684\u6578\u64da\u985e\u578b\uff1a<\/strong>\u78ba\u4fdd\u5728\u6bd4\u8f03\u6642\u4f7f\u7528\u6b63\u78ba\u7684\u6578\u64da\u985e\u578b\uff0c\u4ee5\u907f\u514d\u96b1\u5f0f\u8f49\u63db\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-epefclwnUj\">\u7e3d\u7d50<\/h2>\n<p>WHERE \u5b50\u53e5\u662f MSSQL \u4e2d\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u7cbe\u78ba\u5730\u904e\u6ffe\u67e5\u8a62\u7d50\u679c\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528 WHERE \u5b50\u53e5\uff0c\u60a8\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u7684\u6548\u7387\u548c\u6e96\u78ba\u6027\u3002\u7121\u8ad6\u662f\u57fa\u672c\u67e5\u8a62\u9084\u662f\u8907\u96dc\u7684\u689d\u4ef6\u7d44\u5408\uff0c\u638c\u63e1 WHERE \u5b50\u53e5\u7684\u4f7f\u7528\u90fd\u662f\u5b78\u7fd2 SQL \u7684\u91cd\u8981\u4e00\u6b65\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u8cc7\u6599\u5eab\u7ba1\u7406\u6216\u9700\u8981\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u611f\u8208\u8da3\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\u4ee5\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b66\u4e60 MSSQL \u6559\u7a0b\u4e2d\u7684 SQL WHERE \u5b50\u53e5\uff0c\u638c\u63e1\u5982\u4f55\u6709\u6548\u7b5b\u9009\u6570\u636e\uff0c\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\u548c\u51c6\u786e\u6027\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-159999","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/159999","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=159999"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/159999\/revisions"}],"predecessor-version":[{"id":160000,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/159999\/revisions\/160000"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=159999"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=159999"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=159999"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}