Sql server SQL Server选择条件 < >我想从一个基于一个字段类型的条件的表中选择“计数”（*），考虑下面的代码，我希望在一个查询中这样的事情： select count (*) from moniotr as m case when m.type = 1 begin join paramter as p on p.id = m.paramId where ..... end when m.type = 2 begin join aggTable as ag on ag.id = m.addId where ....

你能告诉我如何在一个查询中处理这个问题吗

为了获得更多的许可，我希望监视器上的计数适用于具有条件1的类型1和具有条件2的类型2，这两种类型的计数之和！

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谢谢

执行两个单独的查询，然后合并结果

select  cnt = sum(cnt)
from
(
select  cnt = count(*)
from    monitor m
        inner join paramter as p on p.id = m.paramId 
where   m.type = 1
union all
select  cnt = count(*)
from    monitor m
        inner join aggTable as ag on ag.id = m.addId
where   m.type = 2
) as d

---

执行两个单独的查询，然后合并结果

select  cnt = sum(cnt)
from
(
select  cnt = count(*)
from    monitor m
        inner join paramter as p on p.id = m.paramId 
where   m.type = 1
union all
select  cnt = count(*)
from    monitor m
        inner join aggTable as ag on ag.id = m.addId
where   m.type = 2
) as d

---

我只是自己试了试，很抱歉问了这么简单的问题我只是自己试了试，很抱歉问了这么简单的问题