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    Pl sql trigger if updating

    1) Create the 'product' table and 'product_price_history' table Once the above update query is executed, the trigger fires and updates the 'product_price_history' table.

    4)If you ROLLBACK the transaction before committing to the database, the data inserted to the table is also rolled back.

    CREATE TABLE emp ( empname text, salary integer, last_date timestamp, last_user text ); CREATE FUNCTION emp_stamp() RETURNS trigger AS $emp_stamp$ BEGIN -- Check that empname and salary are given IF NEW.empname IS NULL THEN RAISE EXCEPTION 'empname cannot be null'; END IF; IF NEW.salary IS NULL THEN RAISE EXCEPTION '% cannot have null salary', NEW.empname; END IF; -- Who works for us when she must pay for it?

    : NEW.salary); dbms_output.put_line('Salary difference: '

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