Question

我有这个查询，它应该返回在特定日期之后创建的数据库中未经验证的帐户的结果。我一直收到这个错误，我不知道如何消除它。这是查询：

select count(*) (nolock)
from dbo.[User]
where ID is not null
and UserStatusID!=2
and CreateDateTime>='5/1/2012'
and not exists (select userid from dbo.UserValidation where dbo.[User].UserID=dbo.UserValidation.UserID)

它出现在＆＃34;其中dbo。[User] .UserID = dbo.UserValidation.UserID＆＃34;我在这里做错了什么？

Answer 1

尝试对表格进行别名处理：

select count(*) (nolock)
from dbo.[User] u
where ID is not null
and UserStatusID != 2
and CreateDateTime >= '5/1/2012'
and not exists (select uv.userid from dbo.UserValidation uv where u.UserID = uv.UserID)

没有架构：

select count(*) (nolock)
    from [User] u
    where ID is not null
    and UserStatusID != 2
    and CreateDateTime >= '5/1/2012'
    and not exists (select uv.userid from UserValidation uv where u.UserID = uv.UserID)

Answer 2

在执行JOIN时，最好明确限定查询中的所有列，如下所示。

select count(u.userid)
from [User] u
where u.ID is not null
and u.UserStatusID != 2
and u.CreateDateTime >= '5/1/2012'
and not exists 
(
select uv.userid 
from UserValidation uv
where uv.UserID = u.UserID
)

如何消除'多部分标识符“”无法绑定'错误？

2 个答案: