{"id":59645,"date":"2024-10-12T23:40:21","date_gmt":"2024-10-12T15:40:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/59645\/"},"modified":"2024-10-12T23:40:21","modified_gmt":"2024-10-12T15:40:21","slug":"cte%e5%92%8cwith-as%e7%9f%ad%e8%aa%9e%e7%b5%90%e5%90%88%e4%bd%bf%e7%94%a8%e6%8f%90%e9%ab%98sql%e6%9f%a5%e8%a9%a2%e6%80%a7%e8%83%bd","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/59645\/","title":{"rendered":"CTE\u548cWITH AS\u77ed\u8a9e\u7d50\u5408\u4f7f\u7528\u63d0\u9ad8SQL\u67e5\u8a62\u6027\u80fd"},"content":{"rendered":"<h1 id=\"cte%e5%92%8cwith-as%e7%9f%ad%e8%aa%9e%e7%b5%90%e5%90%88%e4%bd%bf%e7%94%a8%e6%8f%90%e9%ab%98sql%e6%9f%a5%e8%a9%a2%e6%80%a7%e8%83%bd-PKKjypghqZ\">CTE\u548cWITH AS\u77ed\u8a9e\u7d50\u5408\u4f7f\u7528\u63d0\u9ad8SQL\u67e5\u8a62\u6027\u80fd<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cSQL\u67e5\u8a62\u7684\u6027\u80fd\u512a\u5316\u662f\u6bcf\u4f4d\u958b\u767c\u8005\u548c\u6578\u64da\u5206\u6790\u5e2b\u90fd\u5fc5\u9808\u9762\u5c0d\u7684\u6311\u6230\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0c\u67e5\u8a62\u7684\u6548\u7387\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u91cd\u8981\u3002Common Table Expressions\uff08CTE\uff09\u548cWITH AS\u77ed\u8a9e\u662f\u63d0\u9ad8SQL\u67e5\u8a62\u6027\u80fd\u7684\u6709\u6548\u5de5\u5177\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u9019\u4e9b\u6280\u8853\u7684\u4f7f\u7528\u65b9\u6cd5\u53ca\u5176\u5c0d\u67e5\u8a62\u6027\u80fd\u7684\u5f71\u97ff\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afcte%e5%92%8cwith-as%e7%9f%ad%e8%aa%9e%ef%bc%9f-PKKjypghqZ\">\u4ec0\u9ebc\u662fCTE\u548cWITH AS\u77ed\u8a9e\uff1f<\/h2>\n<p>CTE\u662f\u4e00\u7a2e\u81e8\u6642\u7d50\u679c\u96c6\uff0c\u53ef\u4ee5\u5728\u4e00\u500b\u67e5\u8a62\u4e2d\u591a\u6b21\u5f15\u7528\u3002\u5b83\u7684\u8a9e\u6cd5\u901a\u5e38\u5982\u4e0b\uff1a<\/p>\n<pre><code>WITH CTE_Name AS (\n    SELECT column1, column2\n    FROM table_name\n    WHERE condition\n)\nSELECT *\nFROM CTE_Name;<\/code><\/pre>\n<p>\u9019\u7a2e\u7d50\u69cb\u4f7f\u5f97\u67e5\u8a62\u66f4\u5177\u53ef\u8b80\u6027\uff0c\u4e26\u4e14\u53ef\u4ee5\u907f\u514d\u91cd\u8907\u7684\u5b50\u67e5\u8a62\u3002\u4f7f\u7528CTE\u7684\u597d\u8655\u5728\u65bc\uff0c\u5b83\u53ef\u4ee5\u4f7f\u8907\u96dc\u7684\u67e5\u8a62\u66f4\u6613\u65bc\u7406\u89e3\u548c\u7dad\u8b77\u3002<\/p>\n<h2 id=\"cte%e7%9a%84%e6%80%a7%e8%83%bd%e5%84%aa%e5%8b%a2-PKKjypghqZ\">CTE\u7684\u6027\u80fd\u512a\u52e2<\/h2>\n<p>\u4f7f\u7528CTE\u7684\u4e3b\u8981\u6027\u80fd\u512a\u52e2\u5728\u65bc\u5b83\u80fd\u5920\u6e1b\u5c11\u67e5\u8a62\u7684\u91cd\u8907\u8a08\u7b97\u3002\u7576\u4e00\u500b\u67e5\u8a62\u9700\u8981\u591a\u6b21\u4f7f\u7528\u76f8\u540c\u7684\u5b50\u67e5\u8a62\u6642\uff0cCTE\u53ef\u4ee5\u5c07\u9019\u4e9b\u8a08\u7b97\u96c6\u4e2d\u5728\u4e00\u8d77\uff0c\u5f9e\u800c\u63d0\u9ad8\u6548\u7387\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>WITH SalesCTE AS (\n    SELECT ProductID, SUM(Quantity) AS TotalSales\n    FROM Sales\n    GROUP BY ProductID\n)\nSELECT p.ProductName, s.TotalSales\nFROM Products p\nJOIN SalesCTE s ON p.ProductID = s.ProductID;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0cCTE\u8a08\u7b97\u4e86\u6bcf\u500b\u7522\u54c1\u7684\u7e3d\u92b7\u552e\u91cf\uff0c\u7136\u5f8c\u5728\u4e3b\u67e5\u8a62\u4e2d\u4f7f\u7528\u9019\u500b\u7d50\u679c\uff0c\u907f\u514d\u4e86\u5c0dSales\u8868\u7684\u591a\u6b21\u6383\u63cf\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8cte%e9%80%b2%e8%a1%8c%e9%81%9e%e6%ad%b8%e6%9f%a5%e8%a9%a2-PKKjypghqZ\">\u4f7f\u7528CTE\u9032\u884c\u905e\u6b78\u67e5\u8a62<\/h2>\n<p>CTE\u9084\u652f\u6301\u905e\u6b78\u67e5\u8a62\uff0c\u9019\u5c0d\u65bc\u8655\u7406\u5c64\u6b21\u7d50\u69cb\u6578\u64da\uff08\u5982\u7d44\u7e54\u7d50\u69cb\u6216\u7522\u54c1\u5206\u985e\uff09\u975e\u5e38\u6709\u7528\u3002\u905e\u6b78CTE\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>WITH RecursiveCTE AS (\n    SELECT column1, column2\n    FROM table_name\n    WHERE condition\n    UNION ALL\n    SELECT column1, column2\n    FROM table_name\n    JOIN RecursiveCTE ON table_name.column = RecursiveCTE.column\n)\nSELECT *\nFROM RecursiveCTE;<\/code><\/pre>\n<p>\u9019\u7a2e\u65b9\u5f0f\u53ef\u4ee5\u6709\u6548\u5730\u67e5\u8a62\u5c64\u6b21\u7d50\u69cb\u6578\u64da\uff0c\u4e26\u4e14\u901a\u5e38\u6bd4\u50b3\u7d71\u7684\u905e\u6b78\u67e5\u8a62\u66f4\u5177\u6027\u80fd\u512a\u52e2\u3002<\/p>\n<h2 id=\"with-as%e7%9f%ad%e8%aa%9e%e7%9a%84%e9%9d%88%e6%b4%bb%e6%80%a7-PKKjypghqZ\">WITH AS\u77ed\u8a9e\u7684\u9748\u6d3b\u6027<\/h2>\n<p>WITH AS\u77ed\u8a9e\u4e0d\u50c5\u9650\u65bcCTE\uff0c\u9084\u53ef\u4ee5\u7528\u65bc\u7c21\u5316\u8907\u96dc\u67e5\u8a62\u3002\u5b83\u53ef\u4ee5\u5c07\u591a\u500bCTE\u7d44\u5408\u5728\u4e00\u8d77\uff0c\u5f9e\u800c\u4f7f\u67e5\u8a62\u7d50\u69cb\u66f4\u52a0\u6e05\u6670\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>WITH \n    CTE1 AS (\n        SELECT column1, column2\n        FROM table1\n    ),\n    CTE2 AS (\n        SELECT column1, column2\n        FROM table2\n    )\nSELECT *\nFROM CTE1\nJOIN CTE2 ON CTE1.column = CTE2.column;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u7d50\u69cb\u4f7f\u5f97\u67e5\u8a62\u7684\u908f\u8f2f\u66f4\u52a0\u660e\u78ba\uff0c\u4e26\u4e14\u4fbf\u65bc\u5f8c\u671f\u7684\u7dad\u8b77\u548c\u4fee\u6539\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-PKKjypghqZ\">\u7d50\u8ad6<\/h2>\n<p>CTE\u548cWITH AS\u77ed\u8a9e\u662f\u63d0\u9ad8SQL\u67e5\u8a62\u6027\u80fd\u7684\u91cd\u8981\u5de5\u5177\u3002\u5b83\u5011\u4e0d\u50c5\u80fd\u5920\u63d0\u9ad8\u67e5\u8a62\u7684\u53ef\u8b80\u6027\uff0c\u9084\u80fd\u6709\u6548\u5730\u6e1b\u5c11\u91cd\u8907\u8a08\u7b97\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u8907\u96dc\u67e5\u8a62\u548c\u5c64\u6b21\u7d50\u69cb\u6578\u64da\u6642\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528\u9019\u4e9b\u6280\u8853\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u986f\u8457\u63d0\u5347\u6578\u64da\u5eab\u67e5\u8a62\u7684\u6548\u7387\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\u652f\u6301\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\uff0c\u9019\u5c07\u6709\u52a9\u65bc\u9032\u4e00\u6b65\u63d0\u5347\u60a8\u7684\u6578\u64da\u8655\u7406\u80fd\u529b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u5982\u4f55\u7ed3\u5408\u4f7f\u7528CTE\u548cWITH AS\u77ed\u8bed\u6765\u63d0\u5347SQL\u67e5\u8be2\u6027\u80fd\uff0c\u4f18\u5316\u6570\u636e\u5904\u7406\u6548\u7387\uff0c\u7b80\u5316\u590d\u6742\u67e5\u8be2\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-59645","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/59645","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=59645"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/59645\/revisions"}],"predecessor-version":[{"id":59646,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/59645\/revisions\/59646"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=59645"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=59645"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=59645"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}