Notes
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--QUESTION NUMBER ONE--
--INSERTING
--CREATING FUNCTION
CREATE OR REPLACE FUNCTION func_calc_age(date_of_birth DATE) RETURN NUMBER IS
vn_age NUMBER(3);
BEGIN
vn_age:=FLOOR(MONTHS_BETWEEN(sysdate, date_of_birth)/12);
RETURN vn_age;
END func_calc_age;
/
SHOW ERRORS
--CREATING PROCEDURE
CREATE OR REPLACE PROCEDURE proc_calc_age(date_of_birth DATE) IS
vn_age NUMBER(3);
BEGIN
vn_age:= func_calc_age(date_of_birth);
END proc_calc_age;
/
--EXECUTING PROCEDURE
EXEC proc_calc_age('26-DEC-1987');
--CREATING TRIGGER
CREATE OR REPLACE TRIGGER trig_display_age
AFTER INSERT ON staff
FOR EACH ROW
DECLARE
vn_age NUMBER(3);
BEGIN
vn_age:=func_calc_age(:NEW.date_of_birth);
DBMS_OUTPUT.PUT_LINE(' AGE IS ' || vn_age || '.');
END trig_display_age;
/
SHOW ERRORS
--TESTING TRIGGER
SELECT * FROM staff;
INSERT INTO staff VALUES(1001, 'SWARNIM','RIMAL',NULL, 'HEAD','01-JAN-1965');
--TESTING DATA INSERTION
SELECT * FROM staff;
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