SQLServer单个字段去重的方法

转载自:https://www.cnblogs.com/LC0507/p/11177613.html

单个字段去重并选出每一个分组里面的最大值对应的行：
Row_Number去重：

select from (select ,row_number()over(partition by Servername order by Check_Date desc) Suquence from AuditItem) s where s.Suquence=1

Croup by写法：

select * from [dbo].[AuditItem] where Check_Date in (select Max(Check_Date) from AuditItem group by servername)