SQL SUM question

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 ( tota         


        

Answer 1

SUM is an aggregate function. This means you can aggregate data from a field over several tuples and sum it up into a single tuple.

What you want to do is this:

SELECT 
  table_one.field + table_two.field,
  table_one.field + table_two.field + table_one.anotherfield

or maybe this:

SELECT 
  SUM(table_one.field) + SUM(table_two.field),
  SUM(table_one.field) + SUM(table_two.field) + SUM(table_one.anotherfield)