Trigger Procedures question

I want to check something before
a delete is made.

I made a before delete trigger that
calls a procedure.

The procedure raises an exception
when I don't want the delete to be
made (I could also have returned NULL,
but wouldn't have get much information
from it).

The question is :
What do I return when I want the delete to be made ?

If I return OLD (known when deleting), maybe that
cancels the delete too.

I don't have NEW (known only on insert/update).

I couldn't find the answer in the docs.

Best regards,

Jean-Francois Leveque

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