SQL檢查查詢結果中是否存在值

Question

以下查詢返回僅具有territoryid = 200的所有releaseID

select rt.ReleaseId from ReleaseTerritory rt 
group by rt.ReleaseId
having SUM(case when rt.TerritoryId=200 then 0 else 1 end)=0 

如何在上面的查詢結果中檢查值47033是否存在。 非常感謝。

Answer 1

添加一個where子句，將返回的結果限制為特定的ReleaseId 。

select rt.ReleaseId from ReleaseTerritory rt
where rt.ReleaseId = 47033 
group by rt.ReleaseId
having SUM(case when rt.TerritoryId=200 then 0 else 1 end)=0

要接收諸如yes or exists的值（警告未測試代碼）：

select case when count(rt.ReleaseId) = 0 
then 'Doesnt Exist' 
else 'Exists' end as exists 
from ReleaseTerritory rt
where rt.ReleaseId = 47033 
group by rt.ReleaseId
having SUM(case when rt.TerritoryId=200 then 0 else 1 end)=0

Answer 2

select ReleaseId from ReleaseTerritory
where ReleaseId = 47033
and TerritoryId=200
except
select ReleaseId from ReleaseTerritory 
where ReleaseId = 47033
and TerritoryId <> 200