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sql中CAST()类型转换,索引失效 #331

@253696936

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@253696936

MySQL数据库
SysStatus字段类型为smallint
生成的sql语句使用了CAST类型转化,索引失效
SELECT ExcelSheet.ID AS ID,ExcelSheet.Name AS Name FROM ExcelSheet AS ExcelSheet WHERE (ExcelSheet.UserID = ?P_0 AND CAST(ExcelSheet.SysStatus AS SIGNED) = 1 AND ExcelSheet.ID IN (3))
请问是基于什么原因要进行类型转化?

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