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  3. February 2007

RE: Omit record from SQL AVG based on field value

In Rick's case it was a PICNIC - Problem In Chair Not In Computer (sorry
Rick :)

You're right as far as NULL comparison is concerned though.
Even comparing a field that's NULL against itself or another field that's
NULL will evaluate to NULL.  Why?  Because if something's void of value, how
can you compare it with anything?

Elvis

Celebrating 10-Years of SQL Performance Excellence

-----Original Message-----
Subject: RE: Omit record from SQL AVG based on field value

I believe the reason for this problem is that just about any operation
that includes a NULL returns the value NULL. For example

3 + NULL Returns NULL
Field = NULL Returns NULL
Average(3,5,10, NULL) Returns NULL

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