{"id":137613,"date":"2024-10-31T12:37:18","date_gmt":"2024-10-31T04:37:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/137613\/"},"modified":"2024-10-31T12:37:19","modified_gmt":"2024-10-31T04:37:19","slug":"sql-server%e8%a1%a8%e5%85%a7%e5%ae%b9%e7%9a%84%e7%b5%84%e5%90%88%e7%9a%84%e6%93%8d%e4%bd%9c%e6%a8%a1%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/137613\/","title":{"rendered":"SQL Server\u8868\u5167\u5bb9\u7684\u7d44\u5408\u7684\u64cd\u4f5c\u6a21\u5f0f"},"content":{"rendered":"<h1 id=\"sql-server%e8%a1%a8%e5%85%a7%e5%ae%b9%e7%9a%84%e7%b5%84%e5%90%88%e7%9a%84%e6%93%8d%e4%bd%9c%e6%a8%a1%e5%bc%8f-uOkeHwTMin\">SQL Server\u8868\u5167\u5bb9\u7684\u7d44\u5408\u7684\u64cd\u4f5c\u6a21\u5f0f<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cSQL Server\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u3002\u5b83\u63d0\u4f9b\u4e86\u591a\u7a2e\u64cd\u4f5c\u6a21\u5f0f\u4f86\u8655\u7406\u8868\u4e2d\u7684\u6578\u64da\uff0c\u7279\u5225\u662f\u5728\u6578\u64da\u7684\u7d44\u5408\u548c\u67e5\u8a62\u65b9\u9762\u3002\u672c\u6587\u5c07\u63a2\u8a0eSQL Server\u4e2d\u8868\u5167\u5bb9\u7684\u7d44\u5408\u64cd\u4f5c\u6a21\u5f0f\uff0c\u5305\u62ec\u806f\u63a5\u3001\u5b50\u67e5\u8a62\u548cCTE\uff08\u516c\u7528\u8868\u8868\u9054\u5f0f\uff09\u7b49\u6280\u8853\u3002<\/p>\n<h2 id=\"1-%e8%81%af%e6%8e%a5%ef%bc%88join%ef%bc%89-uOkeHwTMin\">1. \u806f\u63a5\uff08JOIN\uff09<\/h2>\n<p>\u806f\u63a5\u662fSQL Server\u4e2d\u6700\u5e38\u7528\u7684\u64cd\u4f5c\u4e4b\u4e00\uff0c\u7528\u65bc\u5f9e\u591a\u500b\u8868\u4e2d\u6aa2\u7d22\u6578\u64da\u3002\u6839\u64da\u4e0d\u540c\u7684\u9700\u6c42\uff0c\u806f\u63a5\u53ef\u4ee5\u5206\u70ba\u5e7e\u7a2e\u985e\u578b\uff1a<\/p>\n<ul>\n<li><strong>\u5167\u806f\u63a5\uff08INNER JOIN\uff09<\/strong>: \u53ea\u8fd4\u56de\u5169\u500b\u8868\u4e2d\u5339\u914d\u7684\u884c\u3002<\/li>\n<li><strong>\u5de6\u806f\u63a5\uff08LEFT JOIN\uff09<\/strong>: \u8fd4\u56de\u5de6\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u53f3\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u884c\u3002<\/li>\n<li><strong>\u53f3\u806f\u63a5\uff08RIGHT JOIN\uff09<\/strong>: \u8fd4\u56de\u53f3\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u5de6\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u884c\u3002<\/li>\n<li><strong>\u5168\u5916\u806f\u63a5\uff08FULL OUTER JOIN\uff09<\/strong>: \u8fd4\u56de\u5169\u500b\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u7121\u8ad6\u662f\u5426\u6709\u5339\u914d\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u5167\u806f\u63a5\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>SELECT a.Name, b.OrderDate\nFROM Customers a\nINNER JOIN Orders b ON a.CustomerID = b.CustomerID;<\/code><\/pre>\n<h2 id=\"2-%e5%ad%90%e6%9f%a5%e8%a9%a2%ef%bc%88subquery%ef%bc%89-uOkeHwTMin\">2. \u5b50\u67e5\u8a62\uff08Subquery\uff09<\/h2>\n<p>\u5b50\u67e5\u8a62\u662f\u6307\u5728\u4e00\u500b\u67e5\u8a62\u4e2d\u5d4c\u5957\u53e6\u4e00\u500b\u67e5\u8a62\u3002\u9019\u7a2e\u65b9\u5f0f\u53ef\u4ee5\u7528\u4f86\u5728\u4e3b\u67e5\u8a62\u4e2d\u4f7f\u7528\u5b50\u67e5\u8a62\u7684\u7d50\u679c\u3002\u5b50\u67e5\u8a62\u53ef\u4ee5\u653e\u5728SELECT\u3001FROM\u6216WHERE\u5b50\u53e5\u4e2d\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528\u5b50\u67e5\u8a62\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>SELECT Name\nFROM Customers\nWHERE CustomerID IN (SELECT CustomerID FROM Orders WHERE OrderDate &gt; '2023-01-01');<\/code><\/pre>\n<h2 id=\"3-%e5%85%ac%e7%94%a8%e8%a1%a8%e8%a1%a8%e9%81%94%e5%bc%8f%ef%bc%88cte%ef%bc%89-uOkeHwTMin\">3. \u516c\u7528\u8868\u8868\u9054\u5f0f\uff08CTE\uff09<\/h2>\n<p>\u516c\u7528\u8868\u8868\u9054\u5f0f\uff08CTE\uff09\u662f\u4e00\u7a2e\u81e8\u6642\u7d50\u679c\u96c6\uff0c\u53ef\u4ee5\u5728SELECT\u3001INSERT\u3001UPDATE\u6216DELETE\u8a9e\u53e5\u4e2d\u4f7f\u7528\u3002CTE\u7684\u512a\u52e2\u5728\u65bc\u5b83\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u7684\u53ef\u8b80\u6027\u548c\u53ef\u7dad\u8b77\u6027\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u8907\u96dc\u67e5\u8a62\u6642\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500bCTE\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>WITH RecentOrders AS (\n    SELECT CustomerID, OrderDate\n    FROM Orders\n    WHERE OrderDate &gt; '2023-01-01'\n)\nSELECT a.Name, b.OrderDate\nFROM Customers a\nJOIN RecentOrders b ON a.CustomerID = b.CustomerID;<\/code><\/pre>\n<h2 id=\"4-%e7%b5%84%e5%90%88%e6%93%8d%e4%bd%9c%e7%9a%84%e6%80%a7%e8%83%bd%e8%80%83%e9%87%8f-uOkeHwTMin\">4. \u7d44\u5408\u64cd\u4f5c\u7684\u6027\u80fd\u8003\u91cf<\/h2>\n<p>\u5728\u9032\u884c\u8868\u5167\u5bb9\u7684\u7d44\u5408\u64cd\u4f5c\u6642\uff0c\u6027\u80fd\u662f\u4e00\u500b\u91cd\u8981\u7684\u8003\u91cf\u56e0\u7d20\u3002\u4f7f\u7528\u9069\u7576\u7684\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u6b64\u5916\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u806f\u63a5\u548c\u5b50\u67e5\u8a62\uff0c\u4e26\u5408\u7406\u4f7f\u7528CTE\uff0c\u53ef\u4ee5\u5e6b\u52a9\u512a\u5316\u67e5\u8a62\u6548\u7387\u3002<\/p>\n<h2 id=\"5-%e7%b8%bd%e7%b5%90-uOkeHwTMin\">5. \u7e3d\u7d50<\/h2>\n<p>SQL Server\u63d0\u4f9b\u4e86\u591a\u7a2e\u8868\u5167\u5bb9\u7684\u7d44\u5408\u64cd\u4f5c\u6a21\u5f0f\uff0c\u5305\u62ec\u806f\u63a5\u3001\u5b50\u67e5\u8a62\u548cCTE\u7b49\u3002\u9019\u4e9b\u6280\u8853\u4e0d\u50c5\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u6709\u6548\u5730\u6aa2\u7d22\u548c\u64cd\u4f5c\u6578\u64da\uff0c\u9084\u80fd\u63d0\u9ad8\u67e5\u8a62\u7684\u53ef\u8b80\u6027\u548c\u53ef\u7dad\u8b77\u6027\u3002\u5728\u9078\u64c7\u5408\u9069\u7684\u64cd\u4f5c\u6a21\u5f0f\u6642\uff0c\u8003\u616e\u6027\u80fd\u548c\u53ef\u8b80\u6027\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u6258\u7ba1\u60a8\u7684SQL Server\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u696d\u52d9\u63d0\u4f9b\u7a69\u5b9a\u548c\u53ef\u9760\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22SQL Server\u8868\u5167\u5bb9\u7684\u7d44\u5408\u64cd\u4f5c\u6a21\u5f0f\uff0c\u4e86\u89e3\u5982\u4f55\u6709\u6548\u6574\u5408\u6578\u64da\u4ee5\u63d0\u5347\u67e5\u8a62\u6548\u7387\u548c\u6578\u64da\u5206\u6790\u80fd\u529b\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-137613","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/137613","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=137613"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/137613\/revisions"}],"predecessor-version":[{"id":137614,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/137613\/revisions\/137614"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=137613"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=137613"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=137613"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}