Question

I have a variable age to be used on my query like below:

Declare @age as int 11

Select * from people p where p.age = @age

but I want to show all the people between 10 and 13 when I put 0 on @age, so I’m trying to do something like this:

Select * 
from people p 
where p.age in( case 
                     when @age = 0 
                          then 10, 11, 12, 13
                          else @age
                     end
              )

Can someone give me a light?

Answer 1

You do not need a CASE statement, you can just switch your WHERE clause around a bit. This should return the same results:

Select * 
from people p 
where 
( 
    @age = 0 
    AND p.age IN (10, 11, 12, 13)
)
OR
(
    @age != 0 
    AND p.age = @age
)