MySQL query help please

[Darth Cow]

Here is my current MySQL query...

SELECT SUM(hitscount) AS totalhits FROM hits WHERE time>123456789 AND siteid=10 GROUP BY siteid

This query works great most of the time, but sometimes there won't be any result rows that match the criteria. How would I make totalhits be equal to 0 if there are no results returned instead of a mysql resource result with no rows? Thanks for you help .