{"id":152161,"date":"2024-11-01T20:37:22","date_gmt":"2024-11-01T12:37:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/152161\/"},"modified":"2024-11-01T20:37:23","modified_gmt":"2024-11-01T12:37:23","slug":"%e8%a1%a8%e4%b8%admssql-a%e8%a1%a8%e5%85%83%e7%b4%a0%e6%9c%aa%e8%a6%8b%e6%96%bcb%e8%a1%a8%ef%bc%88mssql-a%e8%a1%a8%e4%b8%8d%e5%9c%a8b%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/152161\/","title":{"rendered":"\u8868\u4e2dMSSQL A\u8868\u5143\u7d20\u672a\u898b\u65bcB\u8868\uff08mssql a\u8868\u4e0d\u5728b\uff09"},"content":{"rendered":"<h1 id=\"%e8%a1%a8%e4%b8%admssql-a%e8%a1%a8%e5%85%83%e7%b4%a0%e6%9c%aa%e8%a6%8b%e6%96%bcb%e8%a1%a8%ef%bc%88mssql-a%e8%a1%a8%e4%b8%8d%e5%9c%a8b%ef%bc%89-dfUzgipPKm\">\u8868\u4e2dMSSQL A\u8868\u5143\u7d20\u672a\u898b\u65bcB\u8868\uff08mssql a\u8868\u4e0d\u5728b\uff09<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u4e2d\uff0c\u7d93\u5e38\u9700\u8981\u6bd4\u8f03\u5169\u500b\u8868\u683c\u7684\u6578\u64da\uff0c\u4ee5\u78ba\u5b9a\u54ea\u4e9b\u5143\u7d20\u5b58\u5728\u65bc\u4e00\u500b\u8868\u4e2d\u800c\u4e0d\u5728\u53e6\u4e00\u500b\u8868\u4e2d\u3002\u9019\u7a2e\u60c5\u6cc1\u5728\u4f7f\u7528 Microsoft SQL Server\uff08MSSQL\uff09\u6642\u5c24\u70ba\u5e38\u898b\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u67e5\u627e A \u8868\u4e2d\u5b58\u5728\u4f46\u5728 B \u8868\u4e2d\u672a\u898b\u7684\u5143\u7d20\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684 SQL \u67e5\u8a62\u793a\u4f8b\u3002<\/p>\n<h2 id=\"%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-dfUzgipPKm\">\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u5728 MSSQL \u4e2d\uff0c\u8868\u683c\u662f\u7528\u4f86\u5b58\u5132\u6578\u64da\u7684\u57fa\u672c\u7d50\u69cb\u3002\u6bcf\u500b\u8868\u683c\u7531\u884c\u548c\u5217\u7d44\u6210\uff0c\u884c\u4ee3\u8868\u6578\u64da\u8a18\u9304\uff0c\u5217\u5247\u4ee3\u8868\u6578\u64da\u7684\u5c6c\u6027\u3002\u7576\u6211\u5011\u9700\u8981\u6bd4\u8f03\u5169\u500b\u8868\u683c\u6642\uff0c\u901a\u5e38\u6703\u4f7f\u7528 JOIN \u64cd\u4f5c\u6216\u5b50\u67e5\u8a62\u4f86\u9054\u6210\u76ee\u7684\u3002<\/p>\n<h2 id=\"%e6%9f%a5%e6%89%be-a-%e8%a1%a8%e4%b8%ad%e4%b8%8d%e5%9c%a8-b-%e8%a1%a8%e7%9a%84%e5%85%83%e7%b4%a0-dfUzgipPKm\">\u67e5\u627e A \u8868\u4e2d\u4e0d\u5728 B \u8868\u7684\u5143\u7d20<\/h2>\n<p>\u8981\u67e5\u627e A \u8868\u4e2d\u5b58\u5728\u4f46\u5728 B \u8868\u4e2d\u672a\u898b\u7684\u5143\u7d20\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u67e5\u8a62\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT *\nFROM A\nWHERE id NOT IN (SELECT id FROM B);\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u5047\u8a2d A \u8868\u548c B \u8868\u90fd\u6709\u4e00\u500b\u540d\u70ba <code>id<\/code> \u7684\u5217\u3002\u9019\u500b\u67e5\u8a62\u7684\u908f\u8f2f\u662f\uff1a\u9078\u64c7 A \u8868\u4e2d\u6240\u6709\u7684\u884c\uff0c\u524d\u63d0\u662f\u9019\u4e9b\u884c\u7684 <code>id<\/code> \u4e0d\u5728 B \u8868\u7684 <code>id<\/code> \u5217\u4e2d\u3002<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8-left-join-%e7%9a%84%e6%96%b9%e6%b3%95-dfUzgipPKm\">\u4f7f\u7528 LEFT JOIN \u7684\u65b9\u6cd5<\/h3>\n<p>\u53e6\u4e00\u7a2e\u67e5\u627e A \u8868\u4e2d\u4e0d\u5728 B \u8868\u7684\u5143\u7d20\u7684\u65b9\u6cd5\u662f\u4f7f\u7528 LEFT JOIN\u3002\u9019\u7a2e\u65b9\u6cd5\u53ef\u4ee5\u66f4\u76f4\u89c0\u5730\u986f\u793a\u51fa\u54ea\u4e9b\u5143\u7d20\u662f\u7368\u7279\u7684\uff1a<\/p>\n<pre><code>SELECT A.*\nFROM A\nLEFT JOIN B ON A.id = B.id\nWHERE B.id IS NULL;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u5c07 A \u8868\u548c B \u8868\u9032\u884c LEFT JOIN\uff0c\u7136\u5f8c\u9078\u64c7\u90a3\u4e9b\u5728 B \u8868\u4e2d\u6c92\u6709\u5c0d\u61c9\u884c\u7684 A \u8868\u884c\u3002\u9019\u6a23\u53ef\u4ee5\u6e05\u695a\u5730\u770b\u5230\u54ea\u4e9b\u5143\u7d20\u662f A \u8868\u7279\u6709\u7684\u3002<\/p>\n<h2 id=\"%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8%e6%a1%88%e4%be%8b-dfUzgipPKm\">\u5be6\u969b\u61c9\u7528\u6848\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u5169\u500b\u8868\u683c\uff0c<code>Customers<\/code> \u548c <code>Orders<\/code>\u3002\u6211\u5011\u60f3\u8981\u627e\u51fa\u6240\u6709\u8a3b\u518a\u4e86\u4f46\u5c1a\u672a\u4e0b\u8a02\u55ae\u7684\u5ba2\u6236\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT *\nFROM Customers\nWHERE CustomerID NOT IN (SELECT CustomerID FROM Orders);\n<\/code><\/pre>\n<p>\u6216\u8005\u4f7f\u7528 LEFT JOIN \u7684\u65b9\u5f0f\uff1a<\/p>\n<pre><code>SELECT Customers.*\nFROM Customers\nLEFT JOIN Orders ON Customers.CustomerID = Orders.CustomerID\nWHERE Orders.CustomerID IS NULL;\n<\/code><\/pre>\n<p>\u9019\u5169\u500b\u67e5\u8a62\u90fd\u80fd\u6709\u6548\u5730\u627e\u51fa\u90a3\u4e9b\u5c1a\u672a\u4e0b\u8a02\u55ae\u7684\u5ba2\u6236\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-dfUzgipPKm\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u9032\u884c\u9019\u985e\u67e5\u8a62\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u78ba\u4fdd\u6bd4\u8f03\u7684\u5217\u5177\u6709\u76f8\u540c\u7684\u6578\u64da\u985e\u578b\uff0c\u4ee5\u907f\u514d\u985e\u578b\u4e0d\u5339\u914d\u7684\u932f\u8aa4\u3002<\/li>\n<li>\u5728\u5927\u578b\u6578\u64da\u96c6\u4e0a\u57f7\u884c\u9019\u4e9b\u67e5\u8a62\u6642\uff0c\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\uff0c\u56e0\u6b64\u5efa\u8b70\u5728\u5fc5\u8981\u6642\u4f7f\u7528\u7d22\u5f15\u4f86\u512a\u5316\u67e5\u8a62\u901f\u5ea6\u3002<\/li>\n<li>\u4f7f\u7528 <code>NOT EXISTS<\/code> \u4e5f\u662f\u4e00\u7a2e\u6709\u6548\u7684\u67e5\u8a62\u65b9\u5f0f\uff0c\u7279\u5225\u662f\u5728\u8655\u7406 NULL \u503c\u6642\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-dfUzgipPKm\">\u7e3d\u7d50<\/h2>\n<p>\u5728 MSSQL \u4e2d\uff0c\u67e5\u627e A \u8868\u4e2d\u5b58\u5728\u4f46\u5728 B \u8868\u4e2d\u672a\u898b\u7684\u5143\u7d20\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\u3002\u901a\u904e\u4f7f\u7528 <code>NOT IN<\/code>\u3001<code>LEFT JOIN<\/code> \u6216 <code>NOT EXISTS<\/code> \u7b49 SQL \u67e5\u8a62\u8a9e\u53e5\uff0c\u6211\u5011\u53ef\u4ee5\u8f15\u9b06\u5730\u7372\u5f97\u6240\u9700\u7684\u7d50\u679c\u3002\u9019\u4e9b\u6280\u8853\u4e0d\u50c5\u9069\u7528\u65bc\u6578\u64da\u6bd4\u8f03\uff0c\u9084\u53ef\u4ee5\u61c9\u7528\u65bc\u6578\u64da\u6e05\u7406\u548c\u6578\u64da\u5206\u6790\u7b49\u591a\u7a2e\u5834\u666f\u3002<\/p>\n<p>\u5982\u679c\u60a8\u9700\u8981\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u7ba1\u7406\uff0c\u8acb\u8003\u616e\u6211\u5011\u7684\u670d\u52d9\u3002\u6211\u5011\u63d0\u4f9b\u7a69\u5b9a\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\uff0c\u4ee5\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u67e5\u8a62MSSQL\u4e2dA\u8868\u4e2d\u672a\u51fa\u73fe\u5728B\u8868\u7684\u5143\u7d20\uff0c\u8f15\u9b06\u8b58\u5225\u6578\u64da\u5dee\u7570\uff0c\u512a\u5316\u6578\u64da\u7ba1\u7406\u8207\u5206\u6790\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-152161","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152161","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=152161"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152161\/revisions"}],"predecessor-version":[{"id":152162,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152161\/revisions\/152162"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=152161"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=152161"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=152161"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}