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SQLize.online is a free online SQL environment for quickly running, experimenting with and sharing code. You can run your SQL code on top of the most popular RDBMS including MySQL, MariaDB, SQLite, PostgreSQL, Oracle and Microsoft SQL Server.

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CREATE OR REPLACE TRIGGER TRIGGER_EMP_AUDIT AFTER UPDATE OF SALARY ON EMPLOYEES FOR EACH ROW DECLARE V_SALARIO_ANTERIOR EMPLOYEES.SALARY%TYPE:= 0; BEGIN SELECT SALARY INTO V_SALARIO_ANTERIOR FROM EMPLOYEES WHERE EMPLOYEE_ID = :NEW.EMPLOYEE_ID; IF :OLD.SALARY != :NEW.SALARY THEN INSERT INTO EMP_AUDIT (EMPLOYEE_ID, AUDIT_TIMESTAMP, AUDIT_MESSAGE) VALUES (:NEW.EMPLOYEE_ID, SYSTIMESTAMP, 'El salario anterior era : ' || V_SALARIO_ANTERIOR || ' ahora es : ' || :NEW.SALARY); END IF; END TRIGGER_EMP_AUDIT;

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