{"id":200455,"date":"2025-05-06T11:56:13","date_gmt":"2025-05-06T03:56:13","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200455\/"},"modified":"2025-05-06T11:56:13","modified_gmt":"2025-05-06T03:56:13","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-sql-%e5%b0%86%e8%ae%be%e5%a4%87%e7%b1%bb%e5%88%ab%e5%90%8d%e7%a7%b0%e5%a1%ab%e5%85%85%e5%88%b0%e8%ae%be%e5%a4%87%e8%a1%a8%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200455\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528 SQL \u5c06\u8bbe\u5907\u7c7b\u522b\u540d\u79f0\u586b\u5145\u5230\u8bbe\u5907\u8868\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>\u5982\u4f55\u4f7f\u7528 SQL \u5c06\u8bbe\u5907\u7c7b\u522b\u540d\u79f0\u586b\u5145\u5230\u8bbe\u5907\u8868\uff1f<\/h1>\n<p>\u5728\u6570\u636e\u5e93\u5b9e\u6218\u5f00\u53d1\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u9047\u5230\u4e00\u4e9b\u8fd9\u6837\u90a3\u6837\u7684\u95ee\u9898\uff0c\u7136\u540e\u8981\u5361\u597d\u534a\u5929\uff0c\u7b49\u95ee\u9898\u89e3\u51b3\u4e86\u624d\u53d1\u73b0\u539f\u6765\u4e00\u4e9b\u7ec6\u8282\u77e5\u8bc6\u70b9\u8fd8\u662f\u6ca1\u6709\u638c\u63e1\u597d\u3002\u4eca\u5929\u4e3b\u673a\u5b9d\u8d1d\u5c31\u6574\u7406\u5206\u4eab\u300a\u5982\u4f55\u4f7f\u7528 SQL \u5c06\u8bbe\u5907\u7c7b\u522b\u540d\u79f0\u586b\u5145\u5230\u8bbe\u5907\u8868\uff1f\u300b\uff0c\u804a\u804a\uff0c\u5e0c\u671b\u53ef\u4ee5\u5e2e\u52a9\u5230\u6b63\u5728\u52aa\u529b\u8d5a\u94b1\u7684\u4f60\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241105\/17307985016729e3a556aa6.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u5982\u4f55\u901a\u8fc7 sql \u586b\u5145\u53d8\u66f4\u540e\u7684\u8868\u683c\u6570\u636e<\/strong><\/p>\n<p>\u5df2\u77e5\u7cfb\u7edf\u5b58\u5728\u8bbe\u5907\u7c7b\u522b\u8868 device_category \u4e0e\u8bbe\u5907\u8868 device\uff0c\u9700\u6c42\u53d8\u66f4\u4e3a\u5728 device \u8868\u4e2d\u5197\u4f59\u5b58\u50a8 device_category_name \u5b57\u6bb5\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u5982\u4f55\u901a\u8fc7 sql \u67e5\u8be2\u586b\u5145\u65b0\u589e\u5b57\u6bb5\u7684\u6570\u636e\u3002<\/p>\n<p><strong>sql \u67e5\u8be2<\/strong><\/p>\n<pre>-- \u6dfb\u52a0\u8bbe\u5907\u7c7b\u522b\u540d\u79f0\u5217\nALTER TABLE device ADD COLUMN device_category_name VARCHAR(100);\n\n-- \u586b\u5145\u6570\u636e\nUPDATE device, device_category AS dc SET device.device_category_name = dc.name\nWHERE dc.id = device.device_category_id;<\/pre>\n<p><strong>\u6267\u884c\u6b65\u9aa4<\/strong><\/p>\n<ol>\n<li><strong>\u6dfb\u52a0\u5217<\/strong>\uff1a\u4f7f\u7528 alter table \u8bed\u53e5\u6dfb\u52a0 device_category_name \u5217\u3002<\/li>\n<li><strong>\u586b\u5145\u6570\u636e<\/strong>\uff1a\u4f7f\u7528 update \u548c join \u8bed\u53e5\u4ece device_category \u8868\u4e2d\u83b7\u53d6\u7c7b\u522b\u540d\u79f0\u5e76\u5c06\u5176\u586b\u5145\u5230 device \u8868\u7684 device_category_name \u5217\u4e2d\u3002<\/li>\n<\/ol>\n<p><strong>\u6ce8\u610f\uff1a<\/strong><\/p>\n<p>\u5728\u6267\u884c\u4efb\u4f55\u66f4\u65b0\u64cd\u4f5c\u524d\uff0c\u8bf7\u52a1\u5fc5\u5907\u4efd\u6570\u636e\u3002<\/p>\n<p><strong>\u6f14\u793a<\/strong><\/p>\n<p>\u5728\u7ebf\u6d4b\u8bd5\u5730\u5740\uff1ahttp:\/\/sqlfiddle.com\/#!9\/628d9f\/1<\/p>\n<p>\u672c\u7bc7\u5173\u4e8e\u300a\u5982\u4f55\u4f7f\u7528 SQL \u5c06\u8bbe\u5907\u7c7b\u522b\u540d\u79f0\u586b\u5145\u5230\u8bbe\u5907\u8868\uff1f\u300b\u7684\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\u5566\uff0c\u4f46\u662f\u5b66\u65e0\u6b62\u5883\uff0c\u60f3\u8981\u4e86\u89e3\u5b66\u4e60\u66f4\u591a\u5173\u4e8e\u6570\u636e\u5e93\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u8bf7\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff01<\/p>\n<dl>\n<dt>\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u4f55\u4f7f\u7528 SQL 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