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Tip of the Day
Language: Visual Basic
Expertise: Beginner
Apr 8, 1999

WEBINAR:

On-Demand

Application Security Testing: An Integral Part of DevOps


Check Inequality of Database Field Values

Conventional wisdom suggests this code works fine when checking a field in a database-or any Variant, for that matter-for inequality to some other value:
 
If ![Name] <> "abc" Then
	Debug.Print "<>"
Else
	Debug.Print "="
End If
In reality, however, this isn't always the case. For example, if the field you're checking is of value Null, then the test also returns Null, invoking the Else clause. A quick, though perhaps obscure solution, is to check for equality instead:
 
If ![Name] = "abc" Then
	Debug.Print "="
Else
	Debug.Print "<>"
End If
Andrew L.
 
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