动态数据

Question

我是新来的oracle数据库动态查询，我想

select o.id as ovaid , 
(case when(select count(m.cid) from ovamapper m where m.id = o.id and m.solutionid = 1)>0 then 1 else 0 end) as sol1, 
(case when(select count(m.cid) from ovamapper m where m.id = o.id and m.solutionid = 2)>0 then 1 else 0 end) as sol1, 
(case when(select count(m.cid) from ovamapper m where m.id = o.id and m.solutionid = 3)>0 then 1 else 0 end) as sol1 from ovatemplate o order by o.id 

而是执行了solutionid静态值的下面的查询，我想从其他表中选择它。

任何帮助是非常感谢

Answer 1

你可以使用

加入

到包含solutionid表。前

Select * from ovatemplate JOIN solutiontable ON (solutiontable.ovaid=ovatempate.ovaid) 

后，改变静态值solutionid

Answer 2

尝试此查询

select o.id as ovaid , 
     count(case when solutionid = 1 then m.cid else null end) as sol1 , 
     count(case when solutionid = 2 then m.cid else null end) as sol2 , 
     count(case when solutionid = 3 then m.cid else null end) as sol3 
from ovamapper m , ovatemplate o 
where m.id = o.id 
group by o.id 
order by o.id 

如果你不需要的聚合为列，你或许应该这样做，而不是

select o.id as ovaid , solutionid , count(*) as sol 
from ovamapper m , ovatemplate o 
where m.id = o.id 
and  m.solutionid in (1,2,3) 
group by o.id , solutionid 
order by o.id