Question

Hi I have a question about SUM in sql,

I have a query that looks like this

SELECT 
 SUM ( table_one.field + table_two.field )  as total_field
 SUM ( total_field + table_one.anotherfield )
FROM 
 table_one
JOIN
 table_two ON table_one.id = table_two.id
WHERE 
 table_one = 1

But this doesn’t work ( dont mind possible typing errors in JOIN statement, only the second SUM is the probly the query works perfecly without that SUM)

Is there another way to do it, as I need the total_field within my application. I can ofcource add those numbers within the application but I prefer to do it in sql.

Answer 1

You cannot use the column alias in an aggregate to reference the value, just SUM again;

SELECT 
 SUM ( table_one.field + table_two.field ) as total_field, --your missing a , also
 SUM ( table_one.field + table_two.field + table_one.anotherfield )
FROM 
 table_one
JOIN
 table_two ON table_one.id = table_two.id
WHERE 
 table_one = 1