Question

I have a problem with an SQL query.

SELECT SUM(table_colum) AS value, SUM(value * 3) AS value2 FROM table;

You need to know this is a short representation of my whole query.

The error:

Unknown column 'value' in 'field list'

Is there a way to reuse value in another SUM()?

Answer 1

You can just do:

SELECT SUM(table_colum) AS value, SUM(SUM(table_colum) * 3) AS value2 FROM table;

Internally, the server will only do the SUM(table_colum) calculation once and use the result twice.