What I am trying to do is add another column that calculates (cr - dr)
Seeing as you cannot re-use an alias inside a SELECT clause, how would you go about calculatin
EDIT: DOES NOT WORK. See comments. Isn't using a user variable faster in this case?
SELECT @dr:=SUM(b.bet_win * cy.fx_rate ), @cr:=SUM(b.bet_loss * cy.fx_rate ), @cr+@dr as total