Question

我正在做两个内部联接：

use SalesDWH
go


select COUNT([specimen id])  as [count],[practice name],qlmlismapping.[mlis practice id],[practice code],[Requesting Physician]
from quicklabdump a
inner join qlmlismapping b
on (b.[quiklab practice code] = a.[practice code])
inner join PracticeandPhysician c
on (a.[Requesting Physician]=c.doctorfirstname+' '+c.DOCTORLASTNAME)
where [DATE entered] between '12/1/2011' and '12/31/2011'
group by quicklabdump.[practice name],qlmlismapping.[mlis practice id],[practice code],[Requesting Physician]
order by [count] desc

并收到此错误：

Msg 4104, Level 16, State 1, Line 10
The multi-part identifier "quicklabdump.practice name" could not be bound.
Msg 4104, Level 16, State 1, Line 10
The multi-part identifier "qlmlismapping.mlis practice id" could not be bound.
Msg 4104, Level 16, State 1, Line 3
The multi-part identifier "qlmlismapping.mlis practice id" could not be bound.

我做错了什么？连接不正确吗？

Answer 1

您无法在查询的其余部分中引用qlmlismapping等，因为您已使用别名隐藏它，因此这不是公开的相关名称。

除了实际定义别名之外，您需要在任何地方使用别名而不是基表名。

Answer 2

使用与JOIN相同的别名

select 
       COUNT([specimen id]) as [count],
       [practice name],
       b.[mlis practice id],
       [practice code],
       [Requesting Physician]
from 
     quicklabdump a
     inner join 
     qlmlismapping b on (b.[quiklab practice code] = a.[practice code])
     inner join 
     PracticeandPhysician c on (a.[Requesting Physician]=c.doctorfirstname+' '+c.DOCTORLASTNAME)
where 
     [DATE entered] between '12/1/2011' and '12/31/2011'
group by 
     a.[practice name], 
     b.[mlis practice id],
     [practice code],
     [Requesting Physician]
order by 
     [count] desc

虽然有些注意事项

限定所有列
使用有意义的别名（qld，qlm，pap等）
使用ISO日期yyyymmdd
尝试使用不带空格的列名

在同一查询中执行2个内部联接时出错

2 个答案: