SQL Full Outer Join on same column in same table

Question

This may be more of a design issue than anything, but I\'m hoping it\'s possible without too much voodoo.

Suppose I have a table like this:

SELECT * FROM         


        

Answer 1

You're doing the wrong thing first, and attempting to fix it up afterwards. That's not going to work.

The things you want to join are select * from stuff where grp = 'a' and select * from stuff where grp = 'b'. So join those:

select a.ID as a, b.ID as b from
  (select * from stuff where grp = 'a') a
full join
  (select * from stuff where grp = 'b') b
on b.id = a.id

SQL Fiddle