Andre wrote:
> Hello all,
>
> I have created an insert trigger:
> If I do a count on the table and this count results in a 1 or higher
I
> would not insert the record. (of_id is not the primary key)
>
> CREATE OR REPLACE TRIGGER iu_cli BEFORE insert or update on client
> FOR EACH ROW
> BEGIN
> CC number;
> IF INSERTING
> THEN
> select count(*) into CC from client WHERE of_id = :new.of_id;
> If CC > 1 then
> --do not insert?
> ????????????
> end if;
> END IF;
> END;
> /
>
>
> The Question is: Can I do this this way?
> What code to put on the ???? marks?
None. Use a UNIQUE constraint instead, if your intention is as stated
(do not allow insert if 1 or more records already exist with same
value) rather than as coded (do not allow insert if MORE THAN 1 record
already exists with same value).
Received on Tue Sep 21 2004 - 06:39:52 CDT
