Oracle-L: RE: Avoding Mutation of Table trigger

From: GL2Z/ INF DBA BENLATRECHE <kbenlatreche_at_lth.sonatrach.dz>
Date: Tue, 20 Aug 2002 05:38:23 -0800
Message-ID: <F001.004B9C4E.20020820053823@fatcity.com>

Hi Nabba

One question : Is TAB2 empty and TAB1.AMT values are null or 0 before the creation of the trigger ?

Kamel Benlatreche

-----Message d'origine-----
De : njneog_at_oil.asm.nic.in [mailto:njneog_at_oil.asm.nic.in] Envoyé : mardi 20 août 2002 08:28
À : Multiple recipients of list ORACLE-L Objet : Avoding Mutation of Table trigger

Hi,

This problem/solution may be posted earlier, but would like to hear a solution from you.

I have two table say TAB1 and TAB2. TAB2 is a detail of TAB1 table.

TAB1 Pk_key numnber(10) AMT numnber(14,2) ... More colums pk_key is Primary Key.
TAB2 Pk_key numnber(10) PK_sl number(2) AMT numnber(14,2) ... More colums
pk_key + pk_sl is Primary Key.
pk_key is foreign key to tab1

Now I would like to write a trigger in TAB2 for INSERT and UPDATE operation which will update the AMT coloum of TAB1. The value to be updated is sum of AMT coloumn of TAB2 for the PK_KEY value.

i.e. select sum(amt) into tot from TAB2 where PK_KEY= :NEW.PK_KEY;

Since TAB2 is currently being modified it can not be read.

so, how to solve it ?

TIA Regards.

Naba

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Author: GL2Z/ INF DBA BENLATRECHE
INET: kbenlatreche_at_lth.sonatrach.dz

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