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  • Subject: Re: SQL Update
  • From: "David Morris" <dmorris@xxxxxxxxxxxxx>
  • Date: Fri, 11 Jun 1999 13:21:36 -0600

David,

If you add the following and it should work.  I believe where is 
one of the first things executed.

where exists (SELECT FIELD2 FROM LIBRARY/FILE2 B
WHERE A.KEYFLD = B.KEYFLD)

David Morris


>>> "Leland, David" <dleland@Harter.com> 06/11/99 11:23AM >>>
At version 4.3 we can now update a field in one file with the value of a
field in a different file.  I've seen examples and gone through the
manuals.  I can get it to work a little, but I keep ending up with the
following:

Null values are not allowed in column FIELD1 in table FILE in LIBRARY.

My SQL statement is as follows:
UPDATE LIBRARY/FILE A SET FIELD1 = (SELECT FIELD2 FROM LIBRARY/FILE2 B
WHERE A.KEYFLD = B.KEYFLD)

FIELD1 and FIELD2 have the same attributes.  The KEYFLD's are identical
and unique in both file.  The problem is happening because a record
doesn't always exist in FILE2 for every record in FILE1.  I simply want
the statement to update FIELD1 in FILE1 only if there's a matching
record in FILE2.  I've tried restructuring the statement every way I
could possible think of.  Am I SOL or am I just missing something
obvious?

Thanks,
Dave

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