SELECT to return 0 instead of NULL?

[Tuc at T-B-O-H.NET]

Hi,

        I'm running a query :

SELECT SUM(AcctSessionTime) FROM radacct WHERE UserName='hotspot';

        But if there aren't any rows in "radacct" for the UserName of
"hotspot", it returns a NULL. Is there a way to change it to return 0
instead? (I can't change the application, but I can change the SQL)

                Thanks, Tuc

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