Notes
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CREATE OR REPLACE FUNCTION func_staff_age(vd_staff_dob DATE) RETURN NUMBER IS
vn_staff_age NUMBER(4);
BEGIN
vn_staff_age:=(SYSDATE-vd_staff_dob)/365;
RETURN vn_staff_age;
END func_staff_age;
/
SHOW ERRORS;
CREATE OR REPLACE PROCEDURE proc_clac_staff_age(vd_staff_dob DATE) IS
vn_staff_age NUMBER(4);
BEGIN
vn_staff_age:=func_staff_age(vd_staff_dob);
DBMS_OUTPUT.PUT_LINE('Age of a staff is'|| vn_staff_age);
END proc_clac_staff_age;
/
SHOW ERRORS;
EXECUTE proc_clac_staff_age('02-FEB-2020');
CREATE OR REPLACE TRIGGER trig_staff_age
AFTER INSERT ON staff
FOR EACH ROW
BEGIN
proc_clac_staff_age(:NEW.date_of_birth);
END trig_staff_age;
/
SELECT * FROM staff;
--testing
INSERT INTO staff VALUES (455, 'ALISON','APPLE', NULL, 'HEAD','01-JAN-2000');
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