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Re: a rule question

From: Ludwig Lim <lud_nowhere_man(at)yahoo(dot)com>
To: Brad Paul <bpaul(at)carolina(dot)rr(dot)com>
Cc: PostgreSQL Mailing List <pgsql-novice(at)postgresql(dot)org>
Subject: Re: a rule question
Date: 2002-10-23 16:05:32
Message-ID: 20021023160532.89482.qmail@web80310.mail.yahoo.com (view raw or flat)
Thread:
Lists: pgsql-novice
--- Brad Paul <bpaul(at)carolina(dot)rr(dot)com> wrote:
> I have also tried:
> 
> create rule inventory_usage_insert_rule as
>        on insert to inventory_usage
>        do
> 	update inventory set
> new.in_stock=old.in_stock-inventory_usage.used
> 	       where
> inventory.inventory_id=inventory_usage.inventory_id;
> 

 Try recoding it as :

  CREATE RULE inventory_usage_insert_rule AS
     ON INSERT TO inventory_usage
     DO
        UPDATE inventory
        SET in_stock = in_stock - NEW.used
        WHERE inventory.inventory_id =
NEW.inventory_id;

Hope this helps,

ludwig.


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