Naked girls from orrville ohio - Oracle trigger where clause updating

The source for a MERGE statement can be a table, view, or the result of a subquery.ON Clause - The ON clause specifies the condition that the MERGE operation uses to determine whether it updates or inserts.When the subquery fails to find a matching row in tbl B, the subquery returns NULL.

oracle trigger where clause updating-12

As we’ve already created both the tables in above example, we will directly write a trigger for ‘AFTER UPDATE’.

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.

INTO Clause - The INTO clause is used to specify the target table into which you are inserting or updating.

USING Clause - The USING clause specifies the source of the data to be updated or inserted.

The decision to perform an insert or update is based on conditions specified by you.