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How to delete 1 record from defferent tables?

Plz Help me guys...

I want to delete a record from defferent tables e.g.

tb1 is a parent table

tb2 , tb3 , tb3 are a child table

then if i want to delete the parent the record from child table will also deleted
Sep 12 '07 #1
1 1187
amitpatel66
2,367 Expert 2GB
Plz Help me guys...

I want to delete a record from defferent tables e.g.

tb1 is a parent table

tb2 , tb3 , tb3 are a child table

then if i want to delete the parent the record from child table will also deleted
Make use of ON DELETE CASCADE clause when you create a child table and the foreign key relationship between CHILD and PARENT table.

Eg:
Expand|Select|Wrap|Line Numbers
  1. CREATE TABLE tb1 (sno VARCHAR2(20) PRIMARY KEY)
  2.  
  3. CREATE TABLE tb2(sno VARCHAR2(20), CONSTRAINT FOREIGN KEY REFERENCES tb1(sno) ON DELETE CASCADE)
  4.  
Sep 12 '07 #2

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