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How to perform Cascade Delete In Oracle database

Posted on 2007-03-28
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Last Modified: 2013-12-18
I am using Oracle 10.2.  How do I set up the relationship between parent table and child tables so that when
record is deleted from the parent table it should also delete all the records in the child tables.

Thank you
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Question by:jyem
6 Comments
 
LVL 42

Expert Comment

by:dqmq
ID: 18812170
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Author Comment

by:jyem
ID: 18812521
I created a foreign key in the chilld table and link it to the pramary key in the parent table.  When deleting the record from the parent table I got the following error.

ORA-02292: integrity constraint (CBTM_OWN.CONSIST_DP_LOCO_R01) violated - child record found
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LVL 3

Expert Comment

by:cdemir
ID: 18814043
could you send table scripts
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LVL 13

Accepted Solution

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riazpk earned 2000 total points
ID: 18814095
while declaring the Foreign key, you will have to mention ON DELETE CASCADE option:

SQL>create table parent(a number primary key);

Table created.

SQL>ed
Wrote file afiedt.buf
  1* create table childe(a number, b varchar2(10), constraint child_fk foreign key(a)references parent on delete cascade)
SQL>/

Table created.

SQL>insert into parent values(1);

1 row created.

SQL>ed
Wrote file afiedt.buf

  1* insert into childe values(1, 'ABC')
SQL>/

1 row created.

SQL>commit;

Commit complete.

SQL>delete parent;

1 row deleted.

SQL>commit;

Commit complete.

SQL>SELECT * FROM parent;

no rows selected

SQL>ed
Wrote file afiedt.buf

  1* SELECT * FROM childe
SQL>/

no rows selected

SQL>
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Author Comment

by:jyem
ID: 18815491
Thank you very much everyone.  Riazpk solution works.
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Expert Comment

by:Chip
ID: 22877881
Is there a script that can be run to identify what that one row will affect, if it is deleted?  I need to display all the tables that are dependant on that one record before deleting for documentation purposes.
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