sql - SQL检查查询结果中是否存在值

Question

下面的查询返回所有只有 regionid =200 的 releaseID

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

我该如何检查上面查询的结果中是否存在值47033。非常感谢。

Answer 1

添加一个 where 子句，将返回的结果限制为特定的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

要接收诸如yes or exists（警告未经测试的代码）之类的值：

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