SQL Server 2008 中不带临时表的 SQL 查询

Question

>我有以下 2 个表，我需要获取输出临时表

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

即

 ItemName Status 
  MNO       2

如何在不使用临时表

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

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

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

（如果你以后需要变得更复杂，并且想用初步结果做其他事情）

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

你的问题模棱两可，但这可能是你想要的：

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

或者也许

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

Answer 5

再使用一个join选项

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

其他不同

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

或

否则行数

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