Using SUM() without grouping the results

Question

I already read (this), but couldn\'t figure out a way to implement it to my specific problem. I know SUM() is an aggregate function and it doesn\'t make sense n

Answer 1

This does just one sum() query, so it should perform OK:

SELECT a.id, b.amount
FROM table1 a
cross join (SELECT SUM(amount) as amount FROM table1 AS amount) b