Question

I would like to create a function or procedure that I can use in mysql but I’m not sure what the syntax would be. What I want to do is take the value from a column and see if it’s a 1 or 2, and based on that, return the value from either column A or B.
So for example, my select function would be something like:

select a, b, c, functionA(c) from table;

Below is the pseudo-code of my function

functionA(int x){
      if(x==1)
          //return value in column A
      else
          //return value in column B
}

Answer 1

select a, b, c, IF(c=1, a, b) from table;

or you can use select case but I think IF is more readable.

http://dev.mysql.com/doc/refman/5.0/en/control-flow-functions.html