Re: Help with triggers/FrontBase (was: sequential numbering across more instances)
Re: Help with triggers/FrontBase (was: sequential numbering across more instances)
- Subject: Re: Help with triggers/FrontBase (was: sequential numbering across more instances)
- From: Florijan Stamenkovic <email@hidden>
- Date: Wed, 20 Aug 2008 10:09:11 -0400
On Aug 20, 2008, at 08:40, Ondřej Čada wrote:
CREATE TRIGGER test_insert AFTER INSERT ON TEST REFERENCING NEW x
FOR EACH ROW BEGIN update test set ordernumber=(SELECT MAX
(ordernumber) FROM test)+1 where oid=x.oid AND ordernumber=-1; END
Your update problem aside,
SELECT MAX(column) FROM table
will return null when there are no values yet for that column. I
believe you need to do something like:
SELECT CASE WHEN MAX(column) IS NOT NULL THEN MAX(column) ELSE 0 END
FROM table
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