Why won't this query work?
SELECT 10 AS my_num, my_num*5 AS another_number
In this example, I'm trying to use the my_num alias in other calculations. This results in unknown column "my_num"
This is a simplified version of what I am trying to do, but basically I would like to use an alias to make other calculations. My calculations are much more complicated and thats why it would be nice to alias it since I repeat it several times different ways.