Question

Given a parent + reference tables where Reference table is as follows

Ref_ID    PARENT_ID    
-------------------
1           1            
2           1            
1           2       
3           2       
1           3       
3           3       
4           3       
2           4       
3           4       

I’m trying to return all distinct parent rows where ref_id contains both 2 & 3

The query

SELECT *
FROM  Parent 
WHERE parent_id in (SELECT parent_id from XRefTable where ref_id in (2, 3) )

returns all parent_id 1, 2, 3, 4

WHEREAS the correct result required is to return parent_id 4 which has BOTH ref_id’s 2 & 3, others have EITHER 2 OR 3

Any help is appreciated

FYI – there are 4-7 tables in the query (depending on user selections) so performance is a huge factor

SORRY cannot use stored procedures as it has to work on SQL Server CE too

Answer 1

 SELECT parent_id 
 from XRefTable 
 where ref_id in ( 2, 3 ) 
 group by PARENT_ID 
 having count(distinct ref_id) = 2