PL/SQL functions [duplicate] - plsql

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Homework on PL/SQL FUNCTIONS
plsql functions
Function:
function to Display_Employee_Name_In_Uppercase that accepts the Employee_ID from the Empoyees table and returns the first and the last name of the employee in uppercase.
Write a small PL/SQL program to display the names of the employees whose Employee_IDs are 107, 200 and 205.
this is what I have done I didnt know how to complete it
can help ?
CREATE OR REPLACE FUNCTION disp (emp_id in varchar20) return emp_name
select into emp_name
fname||lname
from employees
where employee_id=emp_id
END disp ;

Answer 1

Something like this...
CREATE OR REPLACE
FUNCTION Fn_Display(p_empId IN VARCHAR2)
RETURN VARCHAR2
IS
empName VARCHAR2(100);
BEGIN
BEGIN
SELECT UPPER(first_name || ' ' || last_name)
INTO empName
FROM Employees
WHERE employee_id = p_empId;
EXCEPTION
WHEN NO_DATA_FOUND THEN
RAISE NO_DATA_FOUND
END;
RETURN empName;
END Fn_Display;
You can call this function wherever you want. here is a sample...
DECLARE
empId VARCHAR2(100);
empName VARCHAR2(100);
BEGIN
empId := &ENTER_EMPLOYEE_ID;
empName := Fn_Display(empId);
DBMS_OUTPUT.PUT_LINE('Employee Name: '||empName);
END;

Answer 2

You could try this code, maybe this one works for you:
CREATE OR REPLACE FUNCTION disp (emp_id in varchar2) return varchar2 IS
emp_name varchar2(256);
BEGIN
select UPPER(fname || ' ' || lname)
into emp_name
from employees
where employee_id = emp_id;
return emp_name;
END disp;