SELECT SUM returns a row when there are no records

Question

I\'m finding some problems with a query that returns the sum of a field from a table for all the records that meet certain conditions. I expected to receive a \"No records f

Answer 1

How about this:

select my_sum
from
(SELECT SUM(dummy) as my_sum FROM DUAL WHERE 1=2)
where
my_sum is not null

Answer 2

use the coalesce function of mysql and do:

SELECT COALESCE(SUM(where),0) FROM table WHERE condition = variable