{"id":157294,"date":"2024-11-02T22:23:21","date_gmt":"2024-11-02T14:23:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/157294\/"},"modified":"2024-11-02T22:23:22","modified_gmt":"2024-11-02T14:23:22","slug":"%e7%88%b6%e5%ad%90%e5%88%86%e9%a1%9e%e9%97%9c%e4%bf%82%e6%9f%a5%e8%a9%a2%e4%bd%bf%e7%94%a8%e7%9a%84-sql-%e8%aa%9e%e5%8f%a5%e4%bb%8b%e7%b4%b9","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/157294\/","title":{"rendered":"\u7236\u5b50\u5206\u985e\u95dc\u4fc2\u67e5\u8a62\u4f7f\u7528\u7684 SQL \u8a9e\u53e5\u4ecb\u7d39"},"content":{"rendered":"<h1 id=\"%e7%88%b6%e5%ad%90%e5%88%86%e9%a1%9e%e9%97%9c%e4%bf%82%e6%9f%a5%e8%a9%a2%e4%bd%bf%e7%94%a8%e7%9a%84-sql-%e8%aa%9e%e5%8f%a5%e4%bb%8b%e7%b4%b9-ozzDEXudHo\">\u7236\u5b50\u5206\u985e\u95dc\u4fc2\u67e5\u8a62\u4f7f\u7528\u7684 SQL \u8a9e\u53e5\u4ecb\u7d39<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u4e2d\uff0c\u7236\u5b50\u5206\u985e\u95dc\u4fc2\u662f\u4e00\u7a2e\u5e38\u898b\u7684\u7d50\u69cb\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5c64\u7d1a\u8cc7\u6599\u6642\uff0c\u4f8b\u5982\u7522\u54c1\u5206\u985e\u3001\u7d44\u7e54\u67b6\u69cb\u7b49\u3002\u9019\u7a2e\u7d50\u69cb\u901a\u5e38\u4f7f\u7528\u6a39\u72c0\u5716\u4f86\u8868\u793a\uff0c\u5176\u4e2d\u6bcf\u500b\u7bc0\u9ede\u53ef\u4ee5\u6709\u591a\u500b\u5b50\u7bc0\u9ede\uff0c\u800c\u6bcf\u500b\u5b50\u7bc0\u9ede\u53c8\u53ef\u4ee5\u6709\u81ea\u5df1\u7684\u5b50\u7bc0\u9ede\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u4f7f\u7528 SQL \u8a9e\u53e5\u4f86\u67e5\u8a62\u9019\u7a2e\u7236\u5b50\u5206\u985e\u95dc\u4fc2\u3002<\/p>\n<h2 id=\"%e7%88%b6%e5%ad%90%e5%88%86%e9%a1%9e%e9%97%9c%e4%bf%82%e7%9a%84%e8%b3%87%e6%96%99%e5%ba%ab%e8%a8%ad%e8%a8%88-ozzDEXudHo\">\u7236\u5b50\u5206\u985e\u95dc\u4fc2\u7684\u8cc7\u6599\u5eab\u8a2d\u8a08<\/h2>\n<p>\u5728\u8a2d\u8a08\u7236\u5b50\u5206\u985e\u95dc\u4fc2\u7684\u8cc7\u6599\u5eab\u6642\uff0c\u901a\u5e38\u6703\u4f7f\u7528\u4e00\u500b\u8868\u683c\u4f86\u5132\u5b58\u5206\u985e\u8cc7\u6599\u3002\u9019\u500b\u8868\u683c\u901a\u5e38\u5305\u542b\u4ee5\u4e0b\u5e7e\u500b\u6b04\u4f4d\uff1a<\/p>\n<ul>\n<li><strong>id<\/strong>: \u552f\u4e00\u8b58\u5225\u78bc<\/li>\n<li><strong>name<\/strong>: \u5206\u985e\u540d\u7a31<\/li>\n<li><strong>parent_id<\/strong>: \u7236\u5206\u985e\u7684 id<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684 SQL \u8868\u683c\u8a2d\u8a08\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>CREATE TABLE categories (\n    id INT PRIMARY KEY AUTO_INCREMENT,\n    name VARCHAR(255) NOT NULL,\n    parent_id INT,\n    FOREIGN KEY (parent_id) REFERENCES categories(id)\n);<\/code><\/pre>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e7%88%b6%e5%88%86%e9%a1%9e-ozzDEXudHo\">\u67e5\u8a62\u7236\u5206\u985e<\/h2>\n<p>\u8981\u67e5\u8a62\u67d0\u4e00\u5206\u985e\u7684\u7236\u5206\u985e\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT * FROM categories WHERE id = (SELECT parent_id FROM categories WHERE id = ?);<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c\u60a8\u9700\u8981\u5c07\u554f\u865f\u66ff\u63db\u70ba\u60a8\u60f3\u67e5\u8a62\u7684\u5206\u985e\u7684 id\u3002\u9019\u500b\u67e5\u8a62\u9996\u5148\u6703\u627e\u5230\u8a72\u5206\u985e\u7684\u7236\u5206\u985e id\uff0c\u7136\u5f8c\u518d\u6839\u64da\u9019\u500b id \u67e5\u8a62\u7236\u5206\u985e\u7684\u8a73\u7d30\u8cc7\u6599\u3002<\/p>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e6%89%80%e6%9c%89%e5%ad%90%e5%88%86%e9%a1%9e-ozzDEXudHo\">\u67e5\u8a62\u6240\u6709\u5b50\u5206\u985e<\/h2>\n<p>\u5982\u679c\u60a8\u60f3\u67e5\u8a62\u67d0\u4e00\u5206\u985e\u7684\u6240\u6709\u5b50\u5206\u985e\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT * FROM categories WHERE parent_id = ?;<\/code><\/pre>\n<p>\u540c\u6a23\uff0c\u60a8\u9700\u8981\u5c07\u554f\u865f\u66ff\u63db\u70ba\u60a8\u60f3\u67e5\u8a62\u7684\u7236\u5206\u985e\u7684 id\u3002\u9019\u500b\u67e5\u8a62\u6703\u8fd4\u56de\u6240\u6709\u76f4\u63a5\u5c6c\u65bc\u8a72\u7236\u5206\u985e\u7684\u5b50\u5206\u985e\u3002<\/p>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e6%95%b4%e5%80%8b%e5%88%86%e9%a1%9e%e6%a8%b9-ozzDEXudHo\">\u67e5\u8a62\u6574\u500b\u5206\u985e\u6a39<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u67e5\u8a62\u6574\u500b\u5206\u985e\u6a39\u3002\u9019\u53ef\u4ee5\u901a\u904e\u905e\u8ff4\u67e5\u8a62\u4f86\u5be6\u73fe\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 Common Table Expressions (CTE) \u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>WITH RECURSIVE category_tree AS (\n    SELECT id, name, parent_id FROM categories WHERE id = ?\n    UNION ALL\n    SELECT c.id, c.name, c.parent_id FROM categories c\n    INNER JOIN category_tree ct ON ct.id = c.parent_id\n)\nSELECT * FROM category_tree;<\/code><\/pre>\n<p>\u9019\u6bb5 SQL \u8a9e\u53e5\u6703\u5f9e\u6307\u5b9a\u7684\u5206\u985e\u958b\u59cb\uff0c\u905e\u8ff4\u67e5\u8a62\u6240\u6709\u5b50\u5206\u985e\uff0c\u76f4\u5230\u6c92\u6709\u66f4\u591a\u7684\u5b50\u5206\u985e\u70ba\u6b62\u3002<\/p>\n<h2 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