Re: SQL Update

[pytel@xxxxxxxxxx]

try

UPDATE A1 A SET FIELD1 =
(select case FIELD2 when NULL then A.FIELD1
                    else FIELD2 end
from A2 B
WHERE A.KEYFLD = B.KEYFLD)


Best regards
    Alexei Pytel



"Leland, David" <dleland@Harter.com> on 06/11/99 12:23:13 PM

Please respond to MIDRANGE-L@midrange.com

To:   "'MIDRANGE-L@midrange.com'" <MIDRANGE-L@midrange.com>
cc:    (bcc: Alexei Pytel/Rochester/IBM)
Subject:  SQL Update





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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