sql - SQL Server 2008 中没有临时表的 SQL 查询

Question

我有以下 2 个表我需要在没有临时表的情况下获得输出

WorkItem

ItemID  ItemName Status
1      xyz       3
2      abc       3
3      MNO       2

WorkItemTrack

TrackID  ItemID  Status
1       1        1
2       1        2
3       1        3
4       2        1
5       2        2
6       3        1
7       3        2

这是我的查询

select ItemName, WorkItem.Status from WorkItem Inner join WorkItemTrack ON WorkItem.ItemID=WorkItemTrack.ItemID
where WorkItemTrack.Status=2

&这是我的输出

  ItemName Status
  XYZ       3
  ABC       3
  MNO       2

但我只需要状态为 2 的 MNO 的输出

IE

 ItemName Status 
  MNO       2

如何不使用临时表

Answer 1

这同样有效

Select x.ItemName,x.Status
From (Select * from WorkItem where Status = 2) x
Join (Select ItemID from WorkItemTrack where Status = 2) y
on x.ItemID=y.ItemID

Answer 2

使用另一种join选择

select a.ItemName, a.Status from WorkItem a Inner join worktrack b ON a.ItemID=b.ItemID and a.status=b.status where b.Status=2

或者

否则不同

select  distinct ItemName, WorkItem.Status from WorkItem inner join worktrack ON WorkItem.ItemID=worktrack.ItemID where workitem.Status=2

或者

否则行号

select  top 1 * from (select row_number() over (partition by workitem.status order by workitem.status ) as rownum , 
ItemName, WorkItem.Status from WorkItem inner join worktrack ON WorkItem.ItemID=worktrack.ItemID
where worktrack.status=2) a 
where a.rownum=1

Answer 3

select i.ItemName, i.Status
from WorkItem i
inner join WorkItemTrack t ON i.ItemID = t.ItemID
where t.Status = 2
AND i.Status = 2

Answer 4

你可以做

select ItemName, WorkItem.Status from WorkItem 
Inner join WorkItemTrack ON WorkItem.ItemID=WorkItemTrack.ItemID 
where WorkItemTrack.Status=2 and WorkItem.Status=2

或者

select * from 
  (select ItemName, WorkItem.Status as status from WorkItem 
   Inner join WorkItemTrack ON WorkItem.ItemID=WorkItemTrack.ItemID 
    where WorkItemTrack.Status=2) 
where status=2

（如果您以后需要变得更复杂，并想用初始结果做其他事情）

Answer 5

您的问题模棱两可，但这可能是您想要的：

SELECT ItemName, wi.Status
FROM WorkItem AS wi
JOIN WorkItemTrack AS wit ON (wi.ItemID=wit.ItemID) AND (wi.Status=wit.Status)
WHERE wit.Status=2

或者可能

SELECT ItemName, wi.Status
FROM WorkItem AS wi
JOIN WorkItemTrack AS wit ON (wi.ItemID=wit.ItemID) AND (wit.Status=2)
WHERE wi.Status=2