Heeeeelp - on update cascade

hi all
I posted the same question inn this forum but did not get any answer i'll try again in this post
my problem is that i created my tables in the database without on delete cascade on the foreign constraint and now 'm trying to modify that
I dropped the old foreign constraint and created new one with "on delete cascade" this worked fine for one table but when i came to the other tables it gave me this error:
ORA-02443:cannot drop constraint - constraint unavailable
but I'm sure the constraint with the name i used is available !!!
what are your suggestions???
another problem:
how to implement on update cascade in Oracle?
I found a solution in http://asktom.oracle.com/tkyte/update_cascade/index.html#download
but I don't know how to use , if someone knows please help
Thanks in advance

1 .
select constraint_type,constraint_name from user_constraints where table_name='<TABLE_NAME>' and
see if the constraint name that you are trying to delete exists.

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    in Sets / Trees and Hierarchies in SQL

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    --CELKO-- Books in Celko Series for Morgan-Kaufmann Publishing: Analytics and OLAP in SQL / Data and Databases: Concepts in Practice Data / Measurements and Standards in SQL SQL for Smarties / SQL Programming Style / SQL Puzzles and Answers / Thinking
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    Bye Alessandro

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