Oracle Create Function

To create a standalone stored function uses the CREATE FUNCTION statement.

Create Function syntax

CREATE OR REPLACE FUNCTION 
	function_name (arg1 data_type, ...)
RETURN data_type
IS
BEGIN
....
END;
/

Create Function example

CREATE FUNCTION get_name (p_id NUMBER)
RETURN VARCHAR2
IS
v_name varchar2(255);
BEGIN
  SELECT name INTO v_name FROM CUSTOMERS WHERE id=p_id;
  RETURN v_name;
END;
/

Call Function example

SELECT get_name(3) FROM dual;