{"id":168529,"date":"2024-11-06T13:08:28","date_gmt":"2024-11-06T05:08:28","guid":{"rendered":"https:\/\/server.hk\/cnblog\/168529\/"},"modified":"2024-11-06T13:08:29","modified_gmt":"2024-11-06T05:08:29","slug":"sql-%e4%b8%ad%e7%9a%84%e9%81%9e%e6%ad%b8%e6%9f%a5%e8%a9%a2%ef%bc%8c%e4%bd%a0%e6%9c%83%e5%97%8e%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/168529\/","title":{"rendered":"SQL \u4e2d\u7684\u905e\u6b78\u67e5\u8a62\uff0c\u4f60\u6703\u55ce\uff1f"},"content":{"rendered":"<h1 id=\"sql-%e4%b8%ad%e7%9a%84%e9%81%9e%e6%ad%b8%e6%9f%a5%e8%a9%a2%ef%bc%8c%e4%bd%a0%e6%9c%83%e5%97%8e%ef%bc%9f-PUxSWhuhST\">SQL \u4e2d\u7684\u905e\u6b78\u67e5\u8a62\uff0c\u4f60\u6703\u55ce\uff1f<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u67e5\u8a62\u662f\u7528\u4f86\u5f9e\u8cc7\u6599\u8868\u4e2d\u6aa2\u7d22\u8cc7\u6599\u7684\u57fa\u672c\u64cd\u4f5c\u4e4b\u4e00\u3002\u7576\u8cc7\u6599\u8868\u4e4b\u9593\u5b58\u5728\u5c64\u7d1a\u95dc\u4fc2\u6642\uff0c\u905e\u6b78\u67e5\u8a62\u4fbf\u6210\u70ba\u4e86\u4e00\u7a2e\u5f37\u5927\u7684\u5de5\u5177\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e SQL \u4e2d\u7684\u905e\u6b78\u67e5\u8a62\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u7bc4\u4f8b\u548c\u61c9\u7528\u5834\u666f\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e9%81%9e%e6%ad%b8%e6%9f%a5%e8%a9%a2%ef%bc%9f-PUxSWhuhST\">\u4ec0\u9ebc\u662f\u905e\u6b78\u67e5\u8a62\uff1f<\/h2>\n<p>\u905e\u6b78\u67e5\u8a62\u662f\u4e00\u7a2e\u67e5\u8a62\u65b9\u5f0f\uff0c\u5141\u8a31\u7528\u6236\u5728 SQL \u4e2d\u81ea\u6211\u5f15\u7528\uff0c\u4ee5\u4fbf\u5f9e\u5c64\u7d1a\u7d50\u69cb\u4e2d\u6aa2\u7d22\u8cc7\u6599\u3002\u9019\u7a2e\u67e5\u8a62\u7279\u5225\u9069\u5408\u7528\u65bc\u8655\u7406\u6a39\u72c0\u7d50\u69cb\u6216\u5716\u5f62\u7d50\u69cb\u7684\u8cc7\u6599\uff0c\u4f8b\u5982\u7d44\u7e54\u67b6\u69cb\u3001\u7522\u54c1\u5206\u985e\u7b49\u3002<\/p>\n<h2 id=\"%e9%81%9e%e6%ad%b8%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-PUxSWhuhST\">\u905e\u6b78\u67e5\u8a62\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u905e\u6b78\u67e5\u8a62\u901a\u5e38\u4f7f\u7528 Common Table Expressions (CTE) \u4f86\u5be6\u73fe\u3002CTE \u662f\u4e00\u7a2e\u81e8\u6642\u7d50\u679c\u96c6\uff0c\u53ef\u4ee5\u5728 SELECT\u3001INSERT\u3001UPDATE \u6216 DELETE \u8a9e\u53e5\u4e2d\u4f7f\u7528\u3002\u4ee5\u4e0b\u662f\u905e\u6b78\u67e5\u8a62\u7684\u57fa\u672c\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>\nWITH RECURSIVE CTE_Name AS (\n    -- \u57fa\u672c\u67e5\u8a62\n    SELECT column1, column2\n    FROM table_name\n    WHERE condition\n\n    UNION ALL\n\n    -- \u905e\u6b78\u67e5\u8a62\n    SELECT column1, column2\n    FROM table_name\n    JOIN CTE_Name ON table_name.column = CTE_Name.column\n)\nSELECT * FROM CTE_Name;\n<\/code><\/pre>\n<h2 id=\"%e7%af%84%e4%be%8b%ef%bc%9a%e7%b5%84%e7%b9%94%e6%9e%b6%e6%a7%8b%e6%9f%a5%e8%a9%a2-PUxSWhuhST\">\u7bc4\u4f8b\uff1a\u7d44\u7e54\u67b6\u69cb\u67e5\u8a62<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>employees<\/code> \u7684\u8cc7\u6599\u8868\uff0c\u7d50\u69cb\u5982\u4e0b\uff1a<\/p>\n<pre><code>\nCREATE TABLE employees (\n    id INT PRIMARY KEY,\n    name VARCHAR(100),\n    manager_id INT\n);\n<\/code><\/pre>\n<p>\u9019\u500b\u8cc7\u6599\u8868\u4e2d\uff0c\u6bcf\u4f4d\u54e1\u5de5\u90fd\u6709\u4e00\u500b <code>manager_id<\/code>\uff0c\u6307\u5411\u5176\u4e0a\u7d1a\u7684 <code>id<\/code>\u3002\u6211\u5011\u5e0c\u671b\u67e5\u8a62\u67d0\u4f4d\u54e1\u5de5\u53ca\u5176\u6240\u6709\u4e0b\u5c6c\u7684\u8cc7\u6599\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528\u905e\u6b78\u67e5\u8a62\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>\nWITH RECURSIVE EmployeeHierarchy AS (\n    SELECT id, name, manager_id\n    FROM employees\n    WHERE id = 1  -- \u5047\u8a2d\u6211\u5011\u67e5\u8a62 id \u70ba 1 \u7684\u54e1\u5de5\n\n    UNION ALL\n\n    SELECT e.id, e.name, e.manager_id\n    FROM employees e\n    JOIN EmployeeHierarchy eh ON e.manager_id = eh.id\n)\nSELECT * FROM EmployeeHierarchy;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u9996\u5148\u9078\u64c7\u4e86 id \u70ba 1 \u7684\u54e1\u5de5\uff0c\u7136\u5f8c\u901a\u904e\u905e\u6b78\u67e5\u8a62\u7372\u53d6\u6240\u6709\u4e0b\u5c6c\u7684\u8cc7\u6599\u3002<\/p>\n<h2 id=\"%e9%81%9e%e6%ad%b8%e6%9f%a5%e8%a9%a2%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-PUxSWhuhST\">\u905e\u6b78\u67e5\u8a62\u7684\u61c9\u7528\u5834\u666f<\/h2>\n<ul>\n<li><strong>\u7d44\u7e54\u67b6\u69cb\u7ba1\u7406\uff1a<\/strong>\u7528\u65bc\u67e5\u8a62\u54e1\u5de5\u53ca\u5176\u4e0b\u5c6c\u7684\u5c64\u7d1a\u7d50\u69cb\u3002<\/li>\n<li><strong>\u7522\u54c1\u5206\u985e\uff1a<\/strong>\u7528\u65bc\u67e5\u8a62\u7522\u54c1\u7684\u5206\u985e\u53ca\u5176\u5b50\u5206\u985e\u3002<\/li>\n<li><strong>\u793e\u4ea4\u7db2\u7d61\uff1a<\/strong>\u7528\u65bc\u67e5\u8a62\u7528\u6236\u4e4b\u9593\u7684\u95dc\u4fc2\uff0c\u4f8b\u5982\u670b\u53cb\u7684\u670b\u53cb\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-PUxSWhuhST\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528\u905e\u6b78\u67e5\u8a62\u6642\uff0c\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u78ba\u4fdd\u905e\u6b78\u67e5\u8a62\u6709\u7d42\u6b62\u689d\u4ef6\uff0c\u5426\u5247\u53ef\u80fd\u5c0e\u81f4\u7121\u9650\u5faa\u74b0\u3002<\/li>\n<li>\u905e\u6b78\u67e5\u8a62\u7684\u6027\u80fd\u53ef\u80fd\u6703\u53d7\u5230\u8cc7\u6599\u91cf\u7684\u5f71\u97ff\uff0c\u5c0d\u65bc\u5927\u578b\u8cc7\u6599\u96c6\uff0c\u61c9\u8b39\u614e\u4f7f\u7528\u3002<\/li>\n<li>\u4e0d\u540c\u7684\u8cc7\u6599\u5eab\u7cfb\u7d71\u5c0d\u65bc\u905e\u6b78\u67e5\u8a62\u7684\u652f\u6301\u7a0b\u5ea6\u53ef\u80fd\u6709\u6240\u4e0d\u540c\uff0c\u9700\u53c3\u8003\u76f8\u61c9\u7684\u6587\u6a94\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-PUxSWhuhST\">\u7e3d\u7d50<\/h2>\n<p>\u905e\u6b78\u67e5\u8a62\u662f\u4e00\u7a2e\u5f37\u5927\u7684 SQL \u67e5\u8a62\u5de5\u5177\uff0c\u80fd\u5920\u6709\u6548\u5730\u8655\u7406\u5c64\u7d1a\u7d50\u69cb\u7684\u8cc7\u6599\u3002\u900f\u904e\u4f7f\u7528 CTE\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u8f15\u9b06\u5730\u5be6\u73fe\u8907\u96dc\u7684\u67e5\u8a62\u9700\u6c42\u3002\u7121\u8ad6\u662f\u5728\u7d44\u7e54\u67b6\u69cb\u3001\u7522\u54c1\u5206\u985e\u9084\u662f\u793e\u4ea4\u7db2\u7d61\u4e2d\uff0c\u905e\u6b78\u67e5\u8a62\u90fd\u80fd\u767c\u63ee\u91cd\u8981\u4f5c\u7528\u3002\u5982\u679c\u60a8\u5c0d\u65bc\u8cc7\u6599\u5eab\u7ba1\u7406\u6709\u66f4\u6df1\u5165\u7684\u9700\u6c42\uff0c\u8003\u616e\u4f7f\u7528 <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u4f86\u642d\u5efa\u60a8\u7684\u8cc7\u6599\u5eab\u74b0\u5883\uff0c\u4eab\u53d7\u66f4\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u80fd\u529b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 SQL \u4e2d\u7684\u905e\u6b78\u67e5\u8a62\uff0c\u5b78\u7fd2\u5982\u4f55\u6709\u6548\u5730\u8655\u7406\u5c64\u6b21\u7d50\u69cb\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u67e5\u8a62\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-168529","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168529","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=168529"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168529\/revisions"}],"predecessor-version":[{"id":168530,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168529\/revisions\/168530"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=168529"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=168529"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=168529"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}