RE: SQL Update

["Leland, David" <dleland@xxxxxxxxxx>]

Didn't work.  SQL doesn't like the syntax.  FIELD2 can't be in the
subselect and doesn't recognize the keyword of NULL.

Dave

> ----------
> From:         pytel@us.ibm.com[SMTP:pytel@us.ibm.com]
> Reply To:     MIDRANGE-L@midrange.com
> Sent:         Friday, June 11, 1999 3:59 PM
> To:   MIDRANGE-L@midrange.com
> Subject:      Re: SQL Update
> 
> 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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