[英]SQL Query without temp table in SQL Server 2008
我有以下2個表,我需要獲取輸出臨時表
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
這是我的查詢
select ItemName, WorkItem.Status from WorkItem Inner join WorkItemTrack ON WorkItem.ItemID=WorkItemTrack.ItemID
where WorkItemTrack.Status=2
這是我的輸出
ItemName Status
XYZ 3
ABC 3
MNO 2
但是我只需要狀態2的MNO的輸出
即
ItemName Status
MNO 2
不使用臨時表怎么辦
這將同樣有效
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
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
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
要么
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
(如果您以后需要變得更復雜,並且想要對初始結果做其他事情)
您的問題不明確,但這可能是您想要的:
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
再使用一個join
選項
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
要么
其他不同
select distinct ItemName, WorkItem.Status from WorkItem inner join worktrack ON WorkItem.ItemID=worktrack.ItemID where workitem.Status=2
要么
否則行號
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
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