{"id":190886,"date":"2024-11-12T15:49:58","date_gmt":"2024-11-12T07:49:58","guid":{"rendered":"https:\/\/server.hk\/cnblog\/190886\/"},"modified":"2024-11-12T15:49:59","modified_gmt":"2024-11-12T07:49:59","slug":"%e9%99%90%e5%ae%9a%e5%85%a9%e5%b0%8f%e6%99%82%ef%bc%81%e4%b8%80%e6%ac%a1%e7%94%b1%e6%ac%8a%e9%99%90%e9%a1%9e%e5%9e%8b%e6%ad%b8%e9%9b%86%e5%bc%95%e7%99%bc%e7%9a%84%e7%b7%8a%e6%80%a5sql%e5%84%aa","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/190886\/","title":{"rendered":"\u9650\u5b9a\u5169\u5c0f\u6642\uff01\u4e00\u6b21\u7531\u6b0a\u9650\u985e\u578b\u6b78\u96c6\u5f15\u767c\u7684\u7dca\u6025SQL\u512a\u5316\u6848\u4f8b"},"content":{"rendered":"<h1 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id=\"%e5%af%a6%e6%96%bd%e9%81%8e%e7%a8%8b-QeSRlfyDOh\">\u5be6\u65bd\u904e\u7a0b<\/h2>\n<p>\u5728\u78ba\u5b9a\u4e86\u512a\u5316\u65b9\u6848\u5f8c\uff0c\u5718\u968a\u8fc5\u901f\u884c\u52d5\u3002\u9996\u5148\uff0c\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\u6dfb\u52a0\u7d22\u5f15\uff1a<\/p>\n<pre><code>CREATE INDEX idx_user_id ON user_permissions(user_id);<\/code><\/pre>\n<p>\u63a5\u8457\uff0c\u91cd\u69cb\u67e5\u8a62\u8a9e\u53e5\uff0c\u5c07\u4e0d\u5fc5\u8981\u7684JOIN\u522a\u9664\uff0c\u4e26\u5c07\u8a08\u7b97\u79fb\u81f3\u61c9\u7528\u5c64\u3002\u6700\u7d42\u7684\u67e5\u8a62\u8a9e\u53e5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT user_id, COUNT(permission_id) AS permission_count\nFROM user_permissions\nWHERE status = 'active'\nGROUP BY user_id;<\/code><\/pre>\n<p>\u6700\u5f8c\uff0c\u5c0d\u6b0a\u9650\u985e\u578b\u7684\u6b78\u96c6\u9032\u884c\u512a\u5316\uff0c\u5c07\u591a\u6b21\u67e5\u8a62\u5408\u4f75\u70ba\u4e00\u6b21\u67e5\u8a62\uff0c\u986f\u8457\u6e1b\u5c11\u4e86\u6578\u64da\u5eab\u7684\u8ca0\u64d4\u3002<\/p>\n<h2 id=\"%e7%b5%90%e6%9e%9c%e8%88%87%e5%8f%8d%e6%80%9d-QeSRlfyDOh\">\u7d50\u679c\u8207\u53cd\u601d<\/h2>\n<p>\u7d93\u904e\u5169\u5c0f\u6642\u7684\u7dca\u6025\u512a\u5316\uff0c\u6578\u64da\u5eab\u7684\u6027\u80fd\u5f97\u5230\u4e86\u986f\u8457\u63d0\u5347\u3002\u67e5\u8a62\u97ff\u61c9\u6642\u9593\u5f9e\u539f\u4f86\u7684\u5e7e\u79d2\u9418\u7e2e\u77ed\u81f3\u6beb\u79d2\u7d1a\u5225\uff0c\u7cfb\u7d71\u7a69\u5b9a\u6027\u4e5f\u5f97\u5230\u4e86\u6539\u5584\u3002\u9019\u6b21\u4e8b\u4ef6\u63d0\u9192\u6211\u5011\uff0c\u6578\u64da\u5eab\u7684\u8a2d\u8a08\u548c\u67e5\u8a62\u512a\u5316\u662f\u6301\u7e8c\u7684\u904e\u7a0b\uff0c\u5b9a\u671f\u7684\u6027\u80fd\u6aa2\u67e5\u548c\u512a\u5316\u662f\u5fc5\u8981\u7684\u3002<\/p>\n<h2 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