{"id":189014,"date":"2024-11-12T03:51:30","date_gmt":"2024-11-11T19:51:30","guid":{"rendered":"https:\/\/server.hk\/cnblog\/189014\/"},"modified":"2024-11-12T03:51:31","modified_gmt":"2024-11-11T19:51:31","slug":"%e6%8f%90%e9%ab%98%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2%e6%95%88%e7%8e%87%ef%bc%9a%e6%b7%ba%e8%ab%87%e8%a6%96%e5%9c%96%e5%9c%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e4%bd%9c%e7%94%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/189014\/","title":{"rendered":"\u63d0\u9ad8\u6578\u64da\u5eab\u67e5\u8a62\u6548\u7387\uff1a\u6dfa\u8ac7\u8996\u5716\u5728\u6578\u64da\u5eab\u4e2d\u7684\u4f5c\u7528 (\u6578\u64da\u5eab\u7684\u8996\u5716\u6709\u4ec0\u9ebc\u7528)"},"content":{"rendered":"<h1 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id=\"%e5%af%a6%e9%9a%9b%e6%a1%88%e4%be%8b-DnfygPtUIJ\">\u5be6\u969b\u6848\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6709\u4e00\u500b\u96fb\u5b50\u5546\u52d9\u5e73\u53f0\uff0c\u6578\u64da\u5eab\u4e2d\u6709\u591a\u500b\u8868\uff0c\u5305\u62ec\u7528\u6236\u8868\u3001\u8a02\u55ae\u8868\u548c\u7522\u54c1\u8868\u3002\u958b\u767c\u8005\u53ef\u4ee5\u5275\u5efa\u4e00\u500b\u8996\u5716\uff0c\u986f\u793a\u6bcf\u500b\u7528\u6236\u7684\u8a02\u55ae\u7e3d\u984d\u548c\u8cfc\u8cb7\u7684\u7522\u54c1\u6578\u91cf\uff1a<\/p>\n<pre><code>CREATE VIEW UserOrderSummary AS\nSELECT u.user_id, u.username, COUNT(o.order_id) AS total_orders, SUM(p.price) AS total_spent\nFROM Users u\nLEFT JOIN Orders o ON u.user_id = o.user_id\nLEFT JOIN Products p ON o.product_id = p.product_id\nGROUP BY u.user_id, 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