{"id":186362,"date":"2024-11-11T05:17:23","date_gmt":"2024-11-10T21:17:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/186362\/"},"modified":"2024-11-11T05:17:24","modified_gmt":"2024-11-10T21:17:24","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e4%bb%a3%e7%a2%bcvalue%e5%b0%8d%e6%95%b8%e6%93%9a%e5%ad%98%e5%84%b2%e8%88%87%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%bd%b1%e9%9f%bf%e3%80%82%ef%bc%88%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/186362\/","title":{"rendered":"\u6578\u64da\u5eab\u4ee3\u78bcvalue\u5c0d\u6578\u64da\u5b58\u5132\u8207\u67e5\u8a62\u7684\u5f71\u97ff\u3002\uff08\u6578\u64da\u5eab\u4ee3\u78bcvalue\uff09"},"content":{"rendered":"

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\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u8a2d\u8a08\u548c\u5be6\u73fe\u5c0d\u65bc\u61c9\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u81f3\u95dc\u91cd\u8981\u3002\u6578\u64da\u5eab\u4ee3\u78bcvalue\uff08Code Value\uff09\u662f\u6307\u5728\u6578\u64da\u5eab\u4e2d\u7528\u65bc\u8868\u793a\u7279\u5b9a\u6578\u64da\u7684\u4ee3\u78bc\u6216\u6a19\u8b58\u7b26\u3002\u9019\u4e9b\u4ee3\u78bc\u901a\u5e38\u7528\u65bc\u7c21\u5316\u6578\u64da\u5b58\u5132\u548c\u67e5\u8a62\u904e\u7a0b\uff0c\u4e26\u4e14\u5c0d\u6578\u64da\u7684\u5b58\u5132\u6548\u7387\u548c\u67e5\u8a62\u6027\u80fd\u6709\u8457\u6df1\u9060\u7684\u5f71\u97ff\u3002<\/p>\n

\u6578\u64da\u5eab\u4ee3\u78bcvalue\u7684\u5b9a\u7fa9<\/h2>\n

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\u6578\u64da\u5b58\u5132\u7684\u5f71\u97ff<\/h2>\n

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\u793a\u4f8b<\/h3>\n
\n-- \u539f\u59cb\u6578\u64da\u8868\nCREATE TABLE Products (\n    ProductID INT,\n    ProductName VARCHAR(100),\n    CategoryName VARCHAR(100)\n);\n\n-- \u4f7f\u7528\u4ee3\u78bcvalue\u7684\u6578\u64da\u8868\nCREATE TABLE Products (\n    ProductID INT,\n    ProductName VARCHAR(100),\n    CategoryCode CHAR(3)\n);\n<\/code><\/pre>\n
\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0cCategoryName\u88ab\u66ff\u63db\u70baCategoryCode\uff0c\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u6bcf\u689d\u8a18\u9304\u7684\u5b58\u5132\u5927\u5c0f\u3002<\/p>\n
\u67e5\u8a62\u6027\u80fd\u7684\u5f71\u97ff<\/h2>\n
\u9664\u4e86\u5b58\u5132\u6548\u7387\u5916\uff0c\u4ee3\u78bcvalue\u9084\u80fd\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u7576\u6578\u64da\u5eab\u4e2d\u4f7f\u7528\u4ee3\u78bcvalue\u6642\uff0c\u67e5\u8a62\u64cd\u4f5c\u901a\u5e38\u6703\u66f4\u5feb\uff0c\u56e0\u70ba\u4ee3\u78bc\u7684\u6bd4\u8f03\u548c\u7d22\u5f15\u64cd\u4f5c\u6bd4\u9577\u5b57\u7b26\u4e32\u7684\u6bd4\u8f03\u8981\u9ad8\u6548\u5f97\u591a\u3002\u9019\u5c0d\u65bc\u9700\u8981\u983b\u7e41\u67e5\u8a62\u7684\u61c9\u7528\u7a0b\u5e8f\u4f86\u8aaa\u5c24\u70ba\u91cd\u8981\u3002<\/p>\n
\u67e5\u8a62\u793a\u4f8b<\/h3>\n
\n-- \u4f7f\u7528\u4ee3\u78bcvalue\u9032\u884c\u67e5\u8a62\nSELECT * FROM Products WHERE CategoryCode = '001';\n<\/code><\/pre>\n
\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u4f7f\u7528\u4ee3\u78bcvalue\u9032\u884c\u67e5\u8a62\u7684\u901f\u5ea6\u6703\u6bd4\u4f7f\u7528\u5b8c\u6574\u7684\u985e\u5225\u540d\u7a31\u5feb\u5f97\u591a\uff0c\u56e0\u70ba\u6578\u64da\u5eab\u53ef\u4ee5\u66f4\u5feb\u5730\u5b9a\u4f4d\u5230\u76f8\u61c9\u7684\u7d22\u5f15\u3002<\/p>\n
\u4ee3\u78bcvalue\u7684\u6311\u6230<\/h2>\n
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\u7d50\u8ad6<\/h2>\n
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