Using an Alias in SQL Calculations

database, mysql, sql, syntax

Solution

Simply wrap your reused alias with `(SELECT alias)` :

SELECT 10 AS my_num, 
       (SELECT my_num) * 5 AS another_number
FROM table

Problem

Why won't this query work? ``` SELECT 10 AS my_num, my_num*5 AS another_number FROM table ``` 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.

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