请帮我解决我想写的sql查询

Question

我想从其父级为CTSC的所有compartmentID中删除IITESE。但我得到了这个错误说

  

Msg 512，Level 16，State 1，Line 3   子查询返回的值超过1。当子查询遵循=，！=，＆lt;，＆lt; =，＆gt;，＆gt; =或子查询用作表达式时，不允许这样做。

我的查询是

delete  from [KRISADMIN].[CompartmentACL] where CompartmentID = (select CompartmentID from [KRISADMIN].[Compartment] where Name = 'CTSC') and 
TrusteeID = (select RoleID from [KRISADMIN].[Role] where Name = 'IITSE') and TrusteeType = 2

如果不好，请原谅我的询问。

Answer 1

当子查询只返回1个值时，可以使用=。

当子查询返回的值超过1时，您必须使用IN或EXISTS：

使用IN：

delete  from [KRISADMIN].[CompartmentACL] 
where CompartmentID IN (select CompartmentID 
                        from [KRISADMIN].[Compartment] 
                        where Name = 'CTSC') 
and TrusteeID IN (select RoleID 
                  from [KRISADMIN].[Role] 
                  where Name = 'IITSE') 
and TrusteeType = 2

了解更多here。

修改

您需要将=替换为IN：

delete from [KRISADMIN].[CompartmentACL] 
where CompartmentID IN (select CompartmentID 
                        from [KRISADMIN].[Compartment] 
                        where Name in (Select Name 
                                       from [KRISADMIN].[Compartment] 
                                       where ParentID IN (Select ParentID 
                                                         from [KRISADMIN].[Compartment] 
                                                         where Name = 'CTSC') )) 
and TrusteeID IN (select RoleID 
                  from [KRISADMIN].[Role] 
                  where Name = 'IITSE') 
and TrusteeType = 2