My purpose in testing whether or not any rows are returned is to prevent a situation where the final $AssignmentIDs variable point at an empty string. I am using this variable in my next SQL statement using the IN syntax. For example, 
SELECT ... FROM ... WHERE AssignmentID IN ($AssignmentIDs)

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This is all very helpful information though. Thanks!

In reply to Re^2: Reusing a variable declared earlier in the same scope by reluctant_techie
in thread Reusing a variable declared earlier in the same scope by reluctant_techie

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