Trigger Assignment Help

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 :

  • Statement-Level Trigger
  • Row-Level Trigger
  • Before Triggers
  • After Triggers

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}

Trigger Assignment Help Order NowDatabase 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:

  • To implement complex business rule, which cannot be implemented using integrity constraints.
  • To audit the process. For example, to keep track of changes made to a table.
  • To automatically perform an action when another concerned action takes place. For example, updating a table whenever there is an insertion or a row into another table.
  • Triggers are similar to stored procedures, but stored procedures are called explicitly and triggers are called implicitly by Oracle when the concerned event occurs.

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