Answer Posted / rafi.sk
A trigger is a SQL procedure that initiates an action when
an event (INSERT, DELETE or UPDATE) occurs. Triggers are
stored in and managed by the DBMS.Triggers are used to
maintain the referential integrity of data by changing the
data in a systematic fashion. A trigger cannot be called or
executed; the DBMS automatically fires the trigger as a
result of a data modification to the associated table.
Triggers can be viewed as similar to stored procedures in
that both consist of procedural logic that is stored at the
database level. Stored procedures, however, are not event-
drive and are not attached to a specific table as triggers
are. Stored procedures are explicitly executed by invoking
a CALL to the procedure while triggers are implicitly
executed. In addition, triggers can also execute stored
procedures.
Nested Trigger: A trigger can also contain INSERT, UPDATE
and DELETE logic within itself, so when the trigger is
fired because of data modification it can also cause
another data modification, thereby firing another trigger.
A trigger that contains data modification logic within
itself is called a nested trigger.
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