SQL & PL/SQL

Hello everyone,

First of all I would like to say that I am a newbie to PL/SQL so please be patient with me. I am trying to create a function that will calculate the average salary for employees and compare the average salary to each employee's salary. If the employee's salary is lower than the average salary, my function will return true, elese it will return false.

I think I have a great start but need some guidance on what to do next. Here's my function so far:

CREATE OR REPLACE FUNCTION check_employee_salary
(p_empno IN NUMBER)
RETURN NUMBER
IS
lv_sal emp.sal%TYPE;
BEGIN
SELECT avg(sal)
INTO lv_sal
FROM emp
WHERE empno = p_empno;
RETURN (lv_sal);
END;
/

My function compiles but I can't figure out how to compare the avg(sal) to sal so that I can return true and false. Any guidance will be appreciated as I really want to understand PL/SQL and am trying very hard.

Thanks