{"id":41624,"date":"2023-06-19T19:32:48","date_gmt":"2023-08-01T17:24:12","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8postgresql%e4%b8%ad%e7%94%9f%e6%88%90%e6%96%90%e6%b3%a2%e9%82%a3%e5%a5%91%e6%95%b0%e5%88%97%e3%80%82\/"},"modified":"2024-01-15T11:04:05","modified_gmt":"2024-01-15T03:04:05","slug":"%e5%9c%a8postgresql%e4%b8%ad%e7%94%9f%e6%88%90%e6%96%90%e6%b3%a2%e9%82%a3%e5%a5%91%e6%95%b0%e5%88%97%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8postgresql%e4%b8%ad%e7%94%9f%e6%88%90%e6%96%90%e6%b3%a2%e9%82%a3%e5%a5%91%e6%95%b0%e5%88%97%e3%80%82\/","title":{"rendered":"\u5728PostgreSQL\u4e2d\u751f\u6210\u6590\u6ce2\u90a3\u5951\u6570\u5217"},"content":{"rendered":"<p>\u7531\u4e8e\u67e5\u8be2\u7ed3\u679c\u8fd8\u6ca1\u6709\u8fd4\u56de\uff0c\u6211\u5f88\u65e0\u804a\uff0c\u6240\u4ee5\u6211\u4e86\u89e3\u4e86\u9012\u5f52\u7684WITH RECURSIVE\uff0c\u5e76\u4e14\u5c1d\u8bd5\u4e86\u4e00\u4e0b\u4ee5\u6d88\u78e8\u65f6\u95f4\u3002\u867d\u7136\u6211\u53ea\u5728PostgreSQL\u4e0a\u5c1d\u8bd5\u8fc7\uff0c\u4f46\u5176\u4ed6\u7684\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u5e94\u8be5\u4e5f\u53ef\u4ee5\u7528\uff08\u53ea\u8981\u652f\u6301WITH RECURSIVE\u5b50\u53e5\uff09\u3002<\/p>\n<p>\u67e5\u8be2\u5982\u4e0b<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">WITH<\/span> <span class=\"k\">RECURSIVE<\/span> <span class=\"n\">fibonacci<\/span><span class=\"p\">(<\/span><span class=\"n\">a<\/span><span class=\"p\">,<\/span> <span class=\"n\">b<\/span><span class=\"p\">,<\/span> <span class=\"k\">c<\/span><span class=\"p\">)<\/span> <span class=\"k\">AS<\/span> <span class=\"p\">(<\/span>\r\n    <span class=\"k\">SELECT<\/span>\r\n        <span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"mi\">0<\/span>\r\n    <span class=\"k\">UNION<\/span> <span class=\"k\">ALL<\/span>\r\n    <span class=\"k\">SELECT<\/span>\r\n        <span class=\"n\">a<\/span> <span class=\"o\">+<\/span> <span class=\"n\">b<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"k\">CASE<\/span>\r\n            <span class=\"k\">WHEN<\/span> <span class=\"n\">a<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">1<\/span> <span class=\"k\">THEN<\/span> <span class=\"mi\">1<\/span>\r\n            <span class=\"k\">ELSE<\/span> <span class=\"n\">b<\/span> <span class=\"o\">+<\/span> <span class=\"k\">c<\/span>\r\n        <span class=\"k\">END<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"n\">a<\/span> <span class=\"o\">-<\/span> <span class=\"k\">c<\/span>\r\n    <span class=\"k\">FROM<\/span> <span class=\"n\">fibonacci<\/span>\r\n    <span class=\"k\">WHERE<\/span> <span class=\"k\">c<\/span> <span class=\"o\">&lt;<\/span> <span class=\"mi\">50<\/span>\r\n<span class=\"p\">)<\/span>\r\n<span class=\"k\">SELECT<\/span> <span class=\"k\">c<\/span> <span class=\"k\">FROM<\/span> <span class=\"n\">fibonacci<\/span>\r\n<\/code><\/pre>\n<p>\u5f97\u51fa\u4e86\u4ee5\u4e0b\u7ed3\u679c\u3002<\/p>\n<pre class=\"post-pre\"><code>0\r\n1\r\n1\r\n2\r\n3\r\n5\r\n8\r\n13\r\n21\r\n34\r\n55\r\n<\/code><\/pre>\n<p>\u592a\u68d2\u4e86\uff01<\/p>\n<p>\u5c1d\u8bd5\u4f7f\u7528GENERATE_SERIES\u6216LAG\u4e4b\u7c7b\u7684\u65b9\u6cd5\uff0c\u5e76\u7ecf\u8fc7\u5404\u79cd\u8bd5\u9a8c\u540e\uff0c\u6211\u53d1\u73b0\u4e0d\u80fd\u5b9e\u73b0\uff0c\u53ea\u80fd\u4f9d\u9760CASE\u8bed\u53e5\u5b9e\u73b0\u3002\u5728\u9012\u5f52\u4e2d\uff0c\u65e0\u6cd5\u4f7f\u7528\u805a\u5408\u51fd\u6570\u3002<\/p>\n<p>\u5982\u679c\u6709\u66f4\u597d\u7684\u65b9\u6cd5\uff0c\u8bf7\u544a\u8bc9\u6211\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7531\u4e8e\u67e5\u8be2\u7ed3\u679c\u8fd8\u6ca1\u6709\u8fd4\u56de\uff0c\u6211\u5f88\u65e0\u804a\uff0c\u6240\u4ee5\u6211\u4e86\u89e3\u4e86\u9012\u5f52\u7684WITH RECURSIVE\uff0c\u5e76\u4e14\u5c1d\u8bd5\u4e86\u4e00\u4e0b\u4ee5\u6d88\u78e8\u65f6\u95f4\u3002\u867d [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-41624","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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