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GUID PKSQL uniqueidentifierMySQL GUIDGuid 值SQL SELECT uniqueidentifierSql uniqueidentifier lengthSqlguidNEWSEQUENTIALIDGUID是 什麼資料庫 PKGUID 用途SQL Server uniqueidentifier data type c#NEWSEQUENTIALID vs NEWIDDeclare guidGUID 索引破碎
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