Archives of the TeradataForum
Message Posted: Wed, 18 Jan 2006 @ 11:35:39 GMT
Subj: | | Aborting an Update (or Insert) within a Trigger |
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From: | | David Clough |
I'd like to prevent updates (or inserts) on TableB based upon certain values in its parent TableA. Specifically I'm going to restrict a column
value on the Child to 'P' (for Purge) if the Parent table has an equivalent column set to 'P'. Put another way, you can only Purge entries on
TableB if Purging is the set approach on the equivalent Parent key on TableA.
I think I can code it but I can't find out how to Signal Error. Does anyone have an example of Aborting an Update (or Insert) within a
Trigger?
Thus far I have created column Check constraints on these tables and Referential Integrity, so it's pretty secure already but it's just this
last possible loop-hole I'd like to plug.
Thanks in advance.
_______________________
Dave Clough
Database Designer
Express ICS
www.tnt.com
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