Question

I need to perform some summations during a select query however depending on 2 values i will need to perform a different equation. hopefully an example will demonstrate

basically i need to perform the following summations

if x > y then (x - y + z) or
if x < y then (x - x + z) basically i am setting this to 0.

So far i thought that i could use 2 tables to dump the x > y values and the x < y values and then perform the relevant equations.

any ideas

Answer 1

You can use a case expression.

select case 
         when x > y then x - y + z
         when x < y then x - x + z
         else 0 -- x = y
       end  
from YourTable