NOT ALLOWING DELETION TRIGGER!!

Dear all, I am having a Master and a Detail table of Customers.. All I would like to do is to create a trigger that should not allow deletion of a Customer in the Master table while there is a record in the Detail table concerning this particular customer..
Any ideas?

Hi Kiriakos Kiriakatos
I would advice you to solve this matter with a foreign key, see example below:
[[email protected]] CREATE TABLE MASTER(K NUMBER PRIMARY KEY);
Table created.
[[email protected]] CREATE TABLE DETAIL(K NUMBER);
Table created.
[[email protected]] ALTER TABLE DETAIL ADD CONSTRAINT FK_MASTER FOREIGN KEY (K) REFERENCES MASTER(K);
Table altered.
[[email protected]] INSERT INTO MASTER VALUES (1);
1 row created.
[[email protected]] INSERT INTO DETAIL VALUES (1);
1 row created.
[[email protected]] DELETE FROM MASTER;
DELETE FROM MASTER
ERROR at line 1:
ORA-02292: integrity constraint (SCOTT.FK_MASTER) violated - child record found
Hope thsio helps!
Remi http://askremi.ora-0000.com

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Hi
Oracle and slqplus versions:
Oracle Database 11g Release 11.2.0.2.0 - 64bit Production
PL/SQL Release 11.2.0.2.0 - Production
CORE 11.2.0.2.0 Production
TNS for Solaris: Version 11.2.0.2.0 - Production
NLSRTL Version 11.2.0.2.0 - Production
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<product_details id="10">
<product id="20">
<type/>
<code/>
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<product id="20">
*<type/>*
<code/>
</product>
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<code/>
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Hi,
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I'm on XE, but 11.2.0.2 nonetheless :
SQL*Plus: Release 11.2.0.2.0 Production on Mer. Nov. 2 11:31:58 2011
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Connected to:
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 <type/>
 <code/>
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SYS_NC_ROWINFO$
<product_details id="10">
<product id="20">
 <code/>
</product>
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OBJECT_VALUE
, '/product_details'
, xmltype('<product id="20"><type></type><code></code></product>')
)Does the NO_XML_QUERY_REWRITE hint solve the problem?
UPDATE /*+ NO_XML_QUERY_REWRITE */ test
SET OBJECT_VALUE = ...

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REFERENCING
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