Introduction - If you have any usage issues, please Google them yourself
SELECT SUM(SALARY)INTO V_sum FROM EMPLOYEES WHERE DEPARTMENT_ID=dept_no
RETURN v_sum
EXCEPTION
WHEN NO_DATA_FOUND THEN
DBMS_OUTPUT.PUT_LINE( 你需要的数据不存在! )
WHEN OTHERS THEN
DBMS_OUTPUT.PUT_LINE(SQLCODE|| - ||SQLERRM)