Answer / surendra reddy

Mutaing error happens with triggers. It occurs because the
trigger is trying to update a row it is currently using.
The usual fix involves either use of views or temporary
tables so the database is selecting from one while updating
the other.

Answer / muthukumar

In trigger when selection and insertion or updation in same
table that time the MUTATING TRIGGER occurs.
U CAN AVOID THAT PROBLEM USE Autonomous transactions .

Answer / megha bidve

Use autonomous transactions because is it we can use commit
inside the trigger.

Autonomous transactions allow you to leave the context of
the calling transaction, perform an independant
transaction, and return to the calling transaction without
affecting it's state. The autonomous transaction has no
link to the calling transaction, so only commited data can
be shared by both transactions.

How would you reference column values before and after you have inserted and deleted triggers?

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