I am having a problem with queries that have an aggregate (sum in this case)
when no rows meet my criteria. I still get back a row with null values for
all fields. Is this the correct behavior? I am trying to sum up daily
sales quanties by items and if I don't have any sales on a particular day, I
want to print nothing. I thought I could do this by detecting a 0 row count
but since I have the aggregates, I still 1 row.
Example:
SELECT itemno,sum(qty) FROM sales WHERE sale_date = 'now()::date'
I would expect to get back zero rows if there were no sales today but I get
back 1. Of course I also get back 1 row if I only sold 1 item. Is this a
bug or a "feature?"
Thanks
Len Morgan
