Oracle trigger if updating column

to ensure that necessary data goes into the table, in some cases allowing the application layer to omit the information from their queries, and in some cases forcing that it be present.The actions that I need to do on my -- Scenario 1 CREATE OR REPLACE TRIGGER my_trg BEFORE INSERT OR UPDATE ON my_table FOR EACH ROW BEGIN IF UPDATING THEN IF : NEW.my_col IS NULL THEN raise_application_error(...); END IF; IF : NEW.my_col2 IS NULL THEN : NEW.my_col2 := (...); END IF; END IF; IF INSERTING THEN IF : NEW.my_col3 IS NULL THEN SELECT my_seq.The separate approach is slightly less risky in case of updates (e.g.



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.PUT_LINE('Record successfully inserted into emp_backup table'); END; Second Problem: We want o update a record in the ’emp_backup’ table if a corresponding record is updated in the ’emp’ table.


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