1
我有如下因素表使用方法:SQL使用分组值在子查询+“其中())列”
Case with columns > ID,ResponsibleID
Action with columns > ID,CaseID,Action
我想所有responsibles的列表以及它们病例数和他们的所有这些案件的总行动数量。
这可能是查询,如果它的工作,但它并不
Select
Case.ResponsibleID,
CaseCount=count(*),
--how can i tell sql that this is the CaseID sublist of the group?
--It would be possible with a subquery, but i rather not do that for performance reasons.
--the real query gets the caseID list from a table 3 or 4 joins later.
ActionCount=(select count(*) from Action where CaseID in Case.CaseID)
From Case
Group by ResponsibleID
+1,编辑数的情况下,而不是responsibles,希望这是确定:) – Andomar 2011-03-08 11:01:49
你大概的意思,COUNT(DISTINCT c.CaseID)。有趣的答案。 – MichaelD 2011-03-08 11:02:08
@Michael,@Andomar敲你自己:) – 2011-03-08 11:05:10