PLSQL basic FUNCTION help

Question

I need help for this issue
Have to write a function which calls 2 other functions and use their results to calculate the OUTPUT resturn by the 3rd.
**Already written functions 1 and 2 ,but confused with calculating percentage
function1()--->first one returns the total number of compulsory questions to be ANSWERED in a SUBJECT.(-we get this value as STRING)
Example--->lets say its 5
function2()--->then,it returns the total number of compulsory questions which has been answered by a person for this subject((-we get this value as STRING))
Example--->already answered is 3
Now,have to write a function function3--->which would return the PERCENTAGE of COMPLETION for the person in this subject.
**Have to call functions 1 and 2 then calculate
Percentage is 3/5 * 100 = 60%

Answer 1

Hi,
Function definition:
CREATE OR REPLACE FUNCTION fnc_calculate_percentaje(p_current_value IN NUMBER,
                                                    p_total_value   IN NUMBER)
   RETURN NUMBER IS
BEGIN
   RETURN(p_current_value / p_total_value * 100);
EXCEPTION
   WHEN zero_divide THEN
      RETURN 0;
END fnc_calculate_percentaje;Example:
Connected to Oracle Database 10g Express Edition Release 10.2.0.1.0
Connected as hr
SQL>
SQL> SET SERVEROUTPUT ON
SQL> DECLARE
  2     v_current_value NUMBER;
  3     v_total_number  NUMBER;
  4  BEGIN
  5     v_current_value := 3; -- call to your function using to_number
  6     v_total_number   := 5; -- call to your function using to_number
  7 
  8     dbms_output.put_line(fnc_calculate_percentaje(p_current_value => v_current_value,
  9                                                   p_total_value   => v_total_number));
10  END;
11  /
60
PL/SQL procedure successfully completed
SQL>Question: why are you returning strings? If you are specting numbers then return numbers! :)
Regards,
Edited by: Walter Fernández on Mar 15, 2009 1:33 PM
Edited by: Walter Fernández on Mar 15, 2009 1:37 PM - Adding simple exception with zero divide case...