RE: Sql Question -- MIDRANGE-L

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The nature of null values is that they can only be found by a test for
null values - they will never show up in a not equal test - if you have
null values in your data you must test for values not equal and values
are null.

This is why my data base does not allow null values unless there is a
good reason for something to contain null values.

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Alan Campin
Sent: Tuesday, August 17, 2010 6:08 PM
To: Midrange Systems Technical Discussion
Subject: Sql Question

I have an SQL statement that compares data in for one table in two
different
libraries. The SQL just says report any record where the initials are
different but when I run it I get nothing.

I had one record where the initials for in one record was Null and in
the
other FUL but the SQL reported them as equal. That doesn't make much
sense.

Does SQL bypass the test if one side is null? Isn't null just a absence
of
data so they would not be equal? Have I found a bug (A big one?

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