Question

Here is a table

CarID| Attribute    | Value
1   | Color     | Red
2   | Color     | Blue 
3   | Color     | Red 
1   | Type      | Coupe 
2   | Type      | Hatch Back 
3   | Type      | Coupe
3   | Make      | Honda
2   | Make      | Toyota
1   | Make      | Ford

Now I would like to run a filter Like Select * From Cars WHERE (Attribute = Color AND Value = Red) AND (Attribute = Make AND Value = Honda)…. and Hope to get the CarID as 3 !

This is simple case of Intersection of 2 queries but I don’t know how to get it done in a single query.

Any help appriciated.

Answer 1

select
      carid,
      count(*) matchedItems
   from
      YourTable
   where
        ( Attribute = 'Color' and Value = 'Red' )
     OR ( Attribute = 'Make' and Value = 'Honda' )
   group by 
      carid 
   having
      matchedItems = 2;

you may have to change the having to…

 having count(*) = 2