Question

supposing I have the following data:

id  name  source
-----------------
1   'n'   'a'
1   'n'   'b'
1   'n'   'c'
1   'n'   'd'    
2   'n'   'a'
2   'n'   'c'

How can I select all ids that contain (source==a || source==f) && (source==c || source==g) ?

This is for MySQL…

Answer 1

select unique id from table as t1
where (t1.source = 'a' or t1.source='f')
  and exists 
   (select * from table as t2
    where t2.id = t1.id and (t2.source = 'c' or t2.source='g')
    )