Answer Posted / pavan_1981

A mutating table is a table that is currently being
modified by an update, delete, or insert statement. For
example, if your trigger contains a select statement or an
update statement referencing the table it is triggering off
of you will receive the error.
Another way this error can occur is if the trigger has
statements to change the primary, foreign or unique key
columns of the table the trigger is triggering off of.

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