select Name,CharacteristicCode from Characteristic where ProductGroupCode='PLBDT' and (Status = -1 or Status=1) group by Name 我想用这条sql语句查出不重复的数据(字段Name中的数据有重复),该怎么写呢?
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直接加 DISTINCT 不可以吗
- SQL code
select DISTINCT Name,CharacteristicCode from Characteristic where ProductGroupCode='PLBDT' and (Status = -1 or Status=1)
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name有重复那么CharacteristicCode有没有重复呢?
如果只是name有重复,CharacteristicCode没有,那你想去掉重复的name,CharacteristicCode就要有个选取标准,是取最大值还是最小值,加个max就可以了。
如果都重复的话,那么直接distinct就可以了。
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- SQL code
select Name,CharacteristicCode from Characteristic AS Awhere ProductGroupCode='PLBDT' and (Status = -1 or Status=1) and CharacteristicCode = (SELECT TOP 1 CharacteristicCode FROM Characteristic WHERE A.Name = Name)