{"id":185908,"date":"2024-11-11T01:30:28","date_gmt":"2024-11-10T17:30:28","guid":{"rendered":"https:\/\/server.hk\/cnblog\/185908\/"},"modified":"2024-11-11T01:30:29","modified_gmt":"2024-11-10T17:30:29","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%9a%e8%a8%98%e9%8c%84%e6%ad%b7%e5%8f%b2%ef%bc%8c%e9%98%b2%e7%af%84%e6%9c%aa%e4%be%86%ef%bc%88%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/185908\/","title":{"rendered":"\u6578\u64da\u5eab\uff1a\u8a18\u9304\u6b77\u53f2\uff0c\u9632\u7bc4\u672a\u4f86\uff08\u6578\u64da\u5eab\uff09"},"content":{"rendered":"<h1 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id=\"%e6%95%b8%e6%93%9a%e7%89%88%e6%9c%ac%e6%8e%a7%e5%88%b6-bqZclCsTDR\">\u6578\u64da\u7248\u672c\u63a7\u5236<\/h3>\n<p>\u5728\u6578\u64da\u5eab\u4e2d\uff0c\u7248\u672c\u63a7\u5236\u662f\u4e00\u7a2e\u5e38\u898b\u7684\u6280\u8853\uff0c\u7528\u65bc\u8a18\u9304\u6578\u64da\u7684\u6b77\u53f2\u8b8a\u5316\u3002\u9019\u53ef\u4ee5\u901a\u904e\u89f8\u767c\u5668\uff08Triggers\uff09\u548c\u6642\u9593\u6233\uff08Timestamps\uff09\u4f86\u5be6\u73fe\u3002\u4f8b\u5982\uff0c\u7576\u4e00\u689d\u8a18\u9304\u88ab\u66f4\u65b0\u6642\uff0c\u53ef\u4ee5\u81ea\u52d5\u751f\u6210\u4e00\u689d\u65b0\u7684\u8a18\u9304\uff0c\u4e26\u5c07\u820a\u7684\u8a18\u9304\u6a19\u8a18\u70ba\u5df2\u904e\u6642\u3002\u9019\u6a23\uff0c\u4f01\u696d\u5c31\u80fd\u5920\u96a8\u6642\u67e5\u8a62\u5230\u6b77\u53f2\u6578\u64da\u3002<\/p>\n<pre><code>CREATE TRIGGER update_history\nAFTER UPDATE ON orders\nFOR EACH ROW\nBEGIN\n    INSERT INTO orders_history (order_id, old_status, new_status, updated_at)\n    VALUES (OLD.id, OLD.status, NEW.status, NOW());\nEND;<\/code><\/pre>\n<h2 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e9%a0%90%e6%b8%ac%e5%8a%9f%e8%83%bd-bqZclCsTDR\">\u6578\u64da\u5eab\u7684\u9810\u6e2c\u529f\u80fd<\/h2>\n<p>\u9664\u4e86\u8a18\u9304\u6b77\u53f2\uff0c\u6578\u64da\u5eab\u9084\u80fd\u5e6b\u52a9\u4f01\u696d\u9032\u884c\u672a\u4f86\u7684\u9810\u6e2c\u3002\u901a\u904e\u6578\u64da\u6316\u6398\u548c\u6a5f\u5668\u5b78\u7fd2\u6280\u8853\uff0c\u4f01\u696d\u53ef\u4ee5\u5f9e\u5927\u91cf\u7684\u6b77\u53f2\u6578\u64da\u4e2d\u63d0\u53d6\u6709\u50f9\u503c\u7684\u4fe1\u606f\uff0c\u9032\u800c\u9810\u6e2c\u672a\u4f86\u7684\u8da8\u52e2\u3002\u4f8b\u5982\uff0c\u96f6\u552e\u5546\u53ef\u4ee5\u5229\u7528\u9867\u5ba2\u7684\u8cfc\u8cb7\u6b77\u53f2\u4f86\u9810\u6e2c\u4ed6\u5011\u672a\u4f86\u7684\u8cfc\u8cb7\u884c\u70ba\uff0c\u5f9e\u800c\u5236\u5b9a\u500b\u6027\u5316\u7684\u71df\u92b7\u7b56\u7565\u3002<\/p>\n<h3 id=\"%e6%95%b8%e6%93%9a%e5%88%86%e6%9e%90%e5%b7%a5%e5%85%b7-bqZclCsTDR\">\u6578\u64da\u5206\u6790\u5de5\u5177<\/h3>\n<p>\u8a31\u591a\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u90fd\u96c6\u6210\u4e86\u6578\u64da\u5206\u6790\u5de5\u5177\uff0c\u9019\u4e9b\u5de5\u5177\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u9032\u884c\u8907\u96dc\u7684\u67e5\u8a62\u548c\u5206\u6790\u3002\u4f8b\u5982\uff0c\u4f7f\u7528SQL\u8a9e\u8a00\uff0c\u4f01\u696d\u53ef\u4ee5\u8f15\u9b06\u5730\u5f9e\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u6240\u9700\u7684\u4fe1\u606f\uff0c\u4e26\u9032\u884c\u9032\u4e00\u6b65\u7684\u5206\u6790\u3002<\/p>\n<pre><code>SELECT product_id, COUNT(*) as sales_count\nFROM orders\nWHERE order_date BETWEEN '2023-01-01' AND '2023-12-31'\nGROUP BY product_id\nORDER BY sales_count DESC;<\/code><\/pre>\n<h2 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