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The CREATE TRIGGER statement has a lot of permutations, but the vast majority of the questions I'm asked relate to basic DML triggers.

Of those, the majority are related to people misunderstanding the order of the timing points and how they are affected by bulk-bind operations and exceptions.

Implementation of SQL triggers is based on the SQL standard.

It supports constructs that are common to most programming languages.

Now before updating ’empid’ column in ’emp’ table see the ’emp’ and ’emp_backup’ table records.

Vishwanath Dalvi is a gifted engineer and tech enthusiast. When not hacking around or supporting the open source community, he is trying to overcome his phobia of dogs.

CREATE or REPLACE TRIGGER emp_after_update AFTER UPDATE OF empid ON emp FOR EACH ROW DECLARE BEGIN update emp_backup set empid = :new.empid where empid = :old.empid; DBMS_OUTPUT.

A trigger is a named database object that is associated with a table, and it activates when a particular event (e.g. The statement CREATE TRIGGER creates a new trigger in My SQL.Hence explicitly specifying FOR EACH ROW is optional.FOR EACH ROW implies that the SQL statements specified in the trigger may be executed (depending on the WHEN clause) for each database row being inserted, updated or deleted by the statement causing the trigger to fire.A database trigger is a stored procedure that automatically executes whenever an event occurs. Oracle initiates an ‘AFTER INSERT’ trigger after an insert event has been occurred and an ‘AFTER UPDATE’ trigger after an update event has been occurred.CREATE or REPLACE TRIGGER emp_after_insert AFTER INSERT ON emp FOR EACH ROW DECLARE BEGIN insert into emp_backup values (:new.empid, :new.fname, :new.lname); DBMS_OUTPUT.




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