Question

请参阅以下查询。

select UserStatus,UserStatus from ((Select 'Active' as UserStatus) 
 union (Select 'Inactive' as UserStatus))a order by UserStatus

错误：

Msg 209, Level 16, State 1, Line 3
Ambiguous column name 'UserStatus'

解决方案：

ALTER DATABASE VCarePortal
SET COMPATIBILITY_LEVEL = 100

90 = SQL Server 2005`enter code here`
100 = SQL Server 2008 and SQL Server 2008 R2
110 = SQL Server 2012.

我尝试了兼容级别模式。但我仍然会犯错误。

Answer 1

请删除一个UserStatus并尝试：

select UserStatus from 
(
    (Select 'Active' as UserStatus) 
    union 
    (Select 'Inactive' as UserStatus)
)a order by UserStatus

Answer 2

您选择了相同的列两次，删除一列并解决问题。无论如何，您不需要两次，因为每个联合的选择只返回一列。

select UserStatus from ((Select 'Active' as UserStatus) 
 union (Select 'Inactive' as UserStatus))a order by UserStatus

Answer 3

在您订购同一列时会产生歧义，因此sql引擎无法理解需要订购哪一列。

因此，使用以下查询将解决您的问题。

-- Order by 1 means order with first column in selection
select UserStatus, UserStatus 
from (
(Select 'Active' as UserStatus) 
 union 
 (Select 'Inactive' as UserStatus)
)a order by 1 


-- Or remove duplicate column from selection.
select UserStatus
from (
(Select 'Active' as UserStatus) 
 union 
 (Select 'Inactive' as UserStatus)
)a order by UserStatus

SQL Server 2012中的模糊列名称错误

3 个答案: