A trigger is procedural code that initiates an action when event like INSERT, DELETE or UPDATE occurs on particular table or view or a database. It is used for maintaining the integrity of the information on the Database Depending upon, when a trigger is fired, it may be classified as :
Trigger Syntax:
CREATE
[DEFINER = {user | CURRENT_USER}]
TRIGGER trigger_name
trigger_time trigger_event
ON tbl_name FOR EACH ROW
trigger_body
trigger_time: {BEFORE | AFTER}
trigger_event: {INSERT | UPDATE | DELETE}
Database trigger is a PL/SQL block that is executed on an event in the database. The event is related to a particular data manipulation of a table such as inserting, deleting or updating a row of a table. Triggers may be used for any of the following:
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