Question

select * from ProjectFeature pf
inner join ProjectArea pa
on pa.AreaId = pf.AreaId
inner join Project p
on p.ProjectId = pa.ProjectId
where (p.ProjectId=175 AND pf.FeatureStatusTypeId=2
AND (pf.FeatureId IN (SELECT dbo.[MaxFeatureVersoinId](pf.FeatureId) AS [FeatureId])) AND (pf.FeatureId IN (SELECT dbo.[MaxFeatureVersoinId](pf.FeatureId) AS [FeatureId])))

我有另一个查询

select * from ProjectFeature pf
inner join ProjectArea pa
on pa.AreaId = pf.AreaId
inner join Project p
on p.ProjectId = pa.ProjectId
where (p.ProjectId=175 AND pf.FeatureStatusTypeId=2
AND (pf.FeatureId IN (SELECT dbo.[MaxFeatureVersoinId](pf.FeatureId) AS [FeatureId])) AND (pf.FeatureId IN (SELECT dbo.[MaxFeatureVersoinId](pf.ChangeRequestToFeatureId) AS [FeatureId])))

第二个查询完全相同，但该函数在查询的最后采用了另一个字段

我试过UNION运算符，但LLBLGEN pro不支持UNION运算符如何在检索结果集的单个查询中进行此操作？

Answer 1

select * from ProjectFeature pf
inner join ProjectArea pa
on pa.AreaId = pf.AreaId
inner join Project p
on p.ProjectId = pa.ProjectId
where (p.ProjectId=175 AND pf.FeatureStatusTypeId=2
AND ((pf.FeatureId IN (SELECT dbo.[MaxFeatureVersoinId](pf.FeatureId) AS [FeatureId])) 
OR (pf.FeatureId IN (SELECT dbo.[MaxFeatureVersoinId](pf.ChangeRequestToFeatureId) AS [FeatureId]))))

删除冗余后，可以减少请求

Answer 2

如果要将结果作为另一行附加在同一查询下，只要它们具有完全相同的列和数据类型，那么您可以使用UNION作为相同的行：

select * from ProjectFeature pf
inner join ProjectArea pa
on pa.AreaId = pf.AreaId
inner join Project p
on p.ProjectId = pa.ProjectId
where (p.ProjectId=175 AND pf.FeatureStatusTypeId=2
AND (pf.FeatureId IN (SELECT dbo.[MaxFeatureVersoinId](pf.FeatureId) AS [FeatureId])) AND (pf.FeatureId IN (SELECT dbo.[MaxFeatureVersoinId](pf.FeatureId) AS [FeatureId])))
UNION
select * from ProjectFeature pf
inner join ProjectArea pa
on pa.AreaId = pf.AreaId
inner join Project p
on p.ProjectId = pa.ProjectId
where (p.ProjectId=175 AND pf.FeatureStatusTypeId=2
AND (pf.FeatureId IN (SELECT dbo.[MaxFeatureVersoinId](pf.FeatureId) AS [FeatureId])) AND (pf.FeatureId IN (SELECT dbo.[MaxFeatureVersoinId](pf.ChangeRequestToFeatureId) AS [FeatureId])))

Answer 3

这是一种重写查询的奇怪方法，但您也可以尝试这样的方法：

select * 
from ProjectFeature pf
inner join ProjectArea pa
  on pa.AreaId = pf.AreaId
inner join Project p
  on p.ProjectId = pa.ProjectId
where 
(
  p.ProjectId=175 
  AND pf.FeatureStatusTypeId=2
  AND (pf.FeatureId IN (SELECT dbo.[MaxFeatureVersoinId](pf.FeatureId) AS [FeatureId])) 
  AND (pf.FeatureId IN (SELECT dbo.[MaxFeatureVersoinId](pf.FeatureId) AS [FeatureId]))
)
OR
(
  p.ProjectId=175 
  AND pf.FeatureStatusTypeId=2
  AND (pf.FeatureId IN (SELECT dbo.[MaxFeatureVersoinId](pf.FeatureId) AS [FeatureId])) 
  AND (pf.FeatureId IN (SELECT dbo.[MaxFeatureVersoinId](pf.ChangeRequestToFeatureId) AS [FeatureId]))
)

将两个WHERE子句放在同一个查询中，并在它们之间加OR。同样在你的第一个查询中，你似乎在重复最后一行，我不知道为什么你需要这样做。

加入SQLsingle查询

3 个答案: