如何写这个SQL语句更新在哪里？

Update [E1$] set [LR/Virtual/MW]='LR' , [Vir No#]=null where [Conc] , [Vir No#] in ( SELECT [Conc] , [Vir No#] FROM [E1$] where [Vir No#] is not null group by Conc , [Vir No#] having Count(LR)<28 ) 

Answer 1

尝试这个：

  Update E set [LR/Virtual/MW]='LR' , [Vir No#]=null from [E1$] E join (SELECT [Conc] , [Vir No#] FROM [E1$] where [Vir No#] is not null group by Conc ,[Vir No#] having Count(LR)<28 ) a on e.[Conc]=a.[Conc] and e.[Vir No#]=a.[Vir No#] 

Answer 2

尝试在where子句中使用括号([conc], [Vir No#]) 。

 Update [E1$] set [LR/Virtual/MW]='LR' , [Vir No#]=null where ([Conc] , [Vir No#]) in ( SELECT [Conc] , [Vir No#] FROM [E1$] where [Vir No#] is not null group by Conc , [Vir No#] having Count(LR)<28 ) 

Answer 3

 Update [E1$] set [LR/Virtual/MW]='LR',[Vir No#]=null where exists( SELECT [Conc] , [Vir No#] FROM [E1$] e2 where [Vir No#] is not null and [E1$].[Conc]=e2.[Conc] and [E1$].[Vir No#]=e2.[Vir No#] group by Conc , [Vir No#] having Count(LR)<28 )