{"id":196155,"date":"2024-11-13T20:56:24","date_gmt":"2024-11-13T12:56:24","guid":{"rendered":"https:\/\/server.hk\/cnblog\/196155\/"},"modified":"2024-11-13T20:56:25","modified_gmt":"2024-11-13T12:56:25","slug":"%e6%8e%8c%e6%8f%a1%e6%9f%a5%e6%89%be%e8%a1%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e8%aa%9e%e5%8f%a5%ef%bc%8c%e8%bc%95%e9%ac%86%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a-%e6%9f%a5%e6%89%be%e8%a1%a8%e6%95%b8%e6%93%9a","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/196155\/","title":{"rendered":"\u638c\u63e1\u67e5\u627e\u8868\u6578\u64da\u5eab\u8a9e\u53e5\uff0c\u8f15\u9b06\u67e5\u8a62\u6578\u64da (\u67e5\u627e\u8868\u6578\u64da\u5eab\u8a9e\u53e5)"},"content":{"rendered":"

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\u67e5\u627e\u8868\u7684\u7d50\u69cb<\/h2>\n

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\nCREATE TABLE CountryCodes (\n    CountryID INT PRIMARY KEY,\n    CountryName VARCHAR(100),\n    CountryCode VARCHAR(10)\n);\n<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0cCountryID \u662f\u9375\uff0c\u800c CountryName \u548c CountryCode \u5247\u662f\u503c\u3002<\/p>\n
\u67e5\u8a62\u67e5\u627e\u8868\u7684\u57fa\u672c\u8a9e\u53e5<\/h2>\n
\u4f7f\u7528\u67e5\u627e\u8868\u9032\u884c\u67e5\u8a62\u7684\u57fa\u672c SQL \u8a9e\u53e5\u5982\u4e0b\uff1a<\/p>\n
\nSELECT CountryName, CountryCode\nFROM CountryCodes\nWHERE CountryID = 1;\n<\/code><\/pre>\n
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\u67e5\u627e\u8868\u7684\u5be6\u969b\u61c9\u7528<\/h2>\n
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\nCREATE TABLE ProductCategories (\n    CategoryID INT PRIMARY KEY,\n    CategoryName VARCHAR(100)\n);\n\nCREATE TABLE Products (\n    ProductID INT PRIMARY KEY,\n    ProductName VARCHAR(100),\n    CategoryID INT,\n    FOREIGN KEY (CategoryID) REFERENCES ProductCategories(CategoryID)\n);\n<\/code><\/pre>\n
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\nSELECT p.ProductName, c.CategoryName\nFROM Products p\nJOIN ProductCategories c ON p.CategoryID = c.CategoryID;\n<\/code><\/pre>\n
\u512a\u5316\u67e5\u8a62\u6027\u80fd<\/h2>\n
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\nCREATE INDEX idx_country_code ON CountryCodes(CountryCode);\n<\/code><\/pre>\n
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\u7e3d\u7d50<\/h2>\n
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