Oracle PL/SQL DROP function example

This article shows you how to use DROP FUNCTION to delete a function from Oracle database.

1. DROP function example

1.1 Create a function get_current_month. Then we will delete the function using DROP FUNCTION statement.

--Creating function
CREATE OR REPLACE FUNCTION get_current_month
RETURN VARCHAR2 IS
curr_month VARCHAR2(10);
BEGIN
    SELECT to_char(sysdate, 'MONTH') INTO curr_month FROM dual;
    return curr_month;
END get_current_month;

1.2 Run it.

select get_current_month() from dual;
-- AUGUST   

1.3 Delete the function get_current_month.

DROP FUNCTION GET_CURRENT_MONTH;
-- function GET_CURRENT_MONTH dropped.

1.4 Run the deleted function get_current_month again.

select get_current_month() from dual;
-- ORA-00904: "GET_CURRENT_MONTH": invalid identifier
-- 00904. 00000 -  "%s: invalid identifier"

References

1. DROP Function :- Oracle official docs