Need to display date result but has to exclude sat & sun day

Question

Hi all,
I need to display date (A), from the plan date (B) for qty more than 10, but the result of A, should be B -10 and should not include sat & sunday.
I managed to do in excel but I have problem in oracle sql here.
My quote in excel, =IF(qty<=10, WORKDAY(plan_date,-5), WORKDAY(plan_date,-10))
If qty=12, plan_date is 30/05/11, the result is 16/05/11
qty=2, plan_date is 30/05/11, the result is 23/05/11
Anyone can help me to quote in SQL ?
Thanks.
Lim

Answer 1

CREATE OR REPLACE FUNCTION GOKHAN.business_date (start_date DATE, days NUMBER)
   RETURN DATE
IS
   counter  number := 0;
   curdate DATE:= start_date;
BEGIN
   WHILE counter < days
   LOOP
      curdate := curdate  - 1;
      IF TO_CHAR (curdate, 'D') BETWEEN 1 AND 5
      THEN
         dbms_output.put_line( curdate || ' ' || TO_CHAR (curdate, 'D'));
         counter := counter + 1;
      END IF;
   END LOOP;
   RETURN curdate;
END;
with t as (
select to_date('30/05/11','DD/MM/YY' ) plan_date, 12 qty from dual
union all
select to_date('30/05/11','DD/MM/YY' ) , 2  from dual
select qty, case when qty <= 10 then business_date( plan_date, 5 ) else business_date( plan_date, 10 ) end plan_date from t;
       QTY PLAN_DATE
        12 16/05/2011
         2 23/05/2011Best Regards,
Gokhan Atil
If this question is answered, please mark appropriate posts as correct/helpful and the thread as closed. Thanks