Question

I have a select statement

SELECT     QBalance
FROM         dbo.CustomerBalance
WHERE     (CustomerID = 1) AND (MarchentID = @MerchantId)

I want to check if that statement returns 0 rows. I tried to use the ISNULL and IFNULL but it seems that I’m missing something.

Answer 1

To find out whether no matching rows exist you can use NOT EXISTS. Which can be more efficient than counting all matching rows

IF NOT EXISTS(SELECT * FROM ...)
BEGIN
PRINT 'No matching row exists'
END