{"id":573,"date":"2024-12-30T09:52:06","date_gmt":"2024-12-30T01:52:06","guid":{"rendered":"http:\/\/xinsk.cn\/?p=573"},"modified":"2025-03-03T11:42:08","modified_gmt":"2025-03-03T03:42:08","slug":"sql-%e9%80%92%e5%bd%92%e6%9f%a5%e8%af%a2%e5%a4%84%e7%90%86%e4%b8%80%e8%a1%8c%e5%8f%98%e5%a4%9a%e8%a1%8c","status":"publish","type":"post","link":"http:\/\/www.xinsk.cn\/?p=573","title":{"rendered":"SQL \u9012\u5f52\u67e5\u8be2\u5904\u7406\u4e00\u884c\u53d8\u591a\u884c"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"274\" height=\"202\" src=\"http:\/\/xinsk.cn\/wp-content\/uploads\/2024\/12\/b481f4d637e0141b0da395b937e189d-1.png\" alt=\"\" class=\"wp-image-576\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">1\u3001\u95ee\u9898\uff1a<\/mark><\/strong>\u7edf\u8ba1\u6240\u6709\u6807\u7b7e\u7684\u51fa\u73b0\u6b21\u6570\uff0c\u6bcf\u884c\u6570\u636e\u7684\u6807\u7b7e\u6570\u91cf\u4e0d\u5b9a\uff0c\u6807\u7b7e\u5185\u5bb9\u4e0d\u5b9a\uff08\u4f7f\u7528\u7684\u662fSQLite\u6570\u636e\u5e93\uff09\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">2\u3001\u5904\u7406\u601d\u8def\uff1a<\/mark><\/strong>\u4ee5\u6807\u7b7e\u5b57\u6bb5\u4e2d\u9017\u53f7\u4e3a\u5206\u5272\u8282\u70b9\uff0c\u6bcf\u6b21\u5904\u7406\u90fd\u53d6\u51fa\u5de6\u4fa7\u7b2c\u4e00\u4e2a\u6807\u7b7e\u7684\u503c\uff0c\u4f20\u9012\u5269\u4f59\u7684\u503c\u4f5c\u4e3a\u4e0b\u4e00\u6b21\u5faa\u73af\u7684\u53c2\u6570\u3002\u9012\u5f52\u4ee5\u6807\u7b7e\u5b57\u6bb5\u4e3a\u7a7a\u4f5c\u4e3a\u7ed3\u675f\u6761\u4ef6\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">3\u3001\u6b65\u9aa4\uff1a<\/mark><\/strong><br>\uff081\uff09\u8bbe\u7f6e\u9012\u5f52\u516c\u7528\u8868\u8fbe\u5f0fsplit\uff1a\u5b57\u6bb5\u5206\u522b\u4e3aid\u3001tab\u548cother_tab\u5206\u522b\u4ee3\u8868\u7740id\u3001\u5f53\u524d\u6807\u7b7e\u548c\u5269\u4f59\u6807\u7b7e\u3002<br>\uff082\uff09\u521d\u59cb\u5316\u6570\u636e\uff1aid\u6b63\u5e38\uff0ctab\u521d\u59cb\u4e3a\u7a7a\uff0c\u6807\u7b7e\u540e\u62fc\u63a5\u9017\u53f7\u786e\u4fdd\u6bcf\u6b21\u90fd\u53ef\u4ee5\u5b9a\u4f4d\u5230\u6807\u7b7e<br>\uff083\uff09\u9012\u5f52\u90e8\u5206\uff1aid\u6b63\u5e38\uff0ctab\u901a\u8fc7substr(other_tab, 0, instr(other_tab, &#8216;,&#8217;))\u53d6\u7b2c\u4e00\u4e2a\u9017\u53f7\u524d\u7684\u6807\u7b7e\uff0cother_tab\u901a\u8fc7substr(other_tab, instr(other_tab, &#8216;,&#8217;)+1)\u53d6\u5269\u4e0b\u7684\u6807\u7b7e\uff0c\u5982\u679cother_tab\u4e0d\u4e3a\u7a7a\uff0c\u5219\u8fd9\u4e00\u6b21other_tab\u8f93\u51fa\u7684\u7ed3\u679c\u4f1a\u4f5c\u4e3a\u4e0b\u4e00\u6b21\u9012\u5f52\u7684other_tab\u7684\u503c\uff0c\u518d\u8fdb\u884c\u4e00\u6b21\u622a\u53d6\uff0c\u76f4\u5230\u6700\u540eother_tab\u7684\u503c\u4e3a\u7a7a\uff0c\u9012\u5f52\u7ed3\u675f\u3002<br>\uff084\uff09\u7ed3\u679c\u5904\u7406\uff1a\u4f9d\u636e\u4e0a\u8ff0\u65b9\u5f0f\uff0c\u6bcf\u6b21\u83b7\u5f97\u5230\u7684\u6807\u7b7e\u6240\u5728\u5b57\u6bb5\u4e3atab\uff0c\u800c\u6211\u4eec\u521d\u59cb\u5316\u7684\u65f6\u5019tab\u662f\u4e3a\u7a7a\u7684\uff0c\u6240\u4ee5\u6211\u4eec\u6b64\u5904\u8981tab!=\u2019\u2019\u3002\u63a5\u7740\u518d\u5bf9\u5f97\u5230\u7684\u6570\u636e\u4f9d\u636etab\u8fdb\u884cGROUP BY + COUNT()\u3002\u7531\u6b64\u6211\u4eec\u53ef\u4ee5\u5f97\u5230\u6240\u6709\u7684\u6807\u7b7e\u4ee5\u53ca\u4ed6\u4eec\u51fa\u73b0\u7684\u6b21\u6570\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>WITH split(id,tab,other_tab) AS\n(\n  -- \u521d\u59cb\u5316\u6570\u636e \n  SELECT\n  \tid,\n  \t'' AS tab,\n  \t\u6807\u7b7e||',' AS other_tab\n  FROM \n  \tokj1ql\n  \t    \n  UNION ALL\n  \n  -- \u9012\u5f52\u4e3b\u4f53\n  SELECT \n  \tid,\n  \tsubstr(other_tab, 0, instr(other_tab, ',')) AS tab,\n  \tsubstr(other_tab, instr(other_tab, ',')+1) AS other_tab\n   FROM \n   \tsplit \n   WHERE \n   \tother_tab!=''\n)\n\n\nSELECT tab,COUNT(tab) num FROM split WHERE tab != '' GROUP BY tab<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>1\u3001\u95ee\u9898\uff1a\u7edf\u8ba1\u6240\u6709\u6807\u7b7e\u7684\u51fa\u73b0\u6b21\u6570\uff0c\u6bcf\u884c\u6570\u636e\u7684\u6807\u7b7e\u6570\u91cf\u4e0d\u5b9a\uff0c\u6807\u7b7e\u5185\u5bb9\u4e0d\u5b9a\uff08\u4f7f\u7528\u7684\u662fSQLite\u6570\u636e\u5e93\uff09\u3002 2\u3001\u5904 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":583,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-573","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sql"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - 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