Create this function:

CREATE OR REPLACE FUNCTION totworkdays (fromdate DATE, todate DATE)
   RETURN NUMBER IS
   totalsundays     NUMBER;
   totalsaturdays   NUMBER;
begin
   totalsundays
        := NEXT_DAY (todate – 7, ‘sunday’)
           – NEXT_DAY (fromdate – 1, ‘sunday’);
   totalsaturdays
      :=   NEXT_DAY (todate – 7, ‘saturday’)
         – NEXT_DAY (fromdate – 1, ‘saturday’);

   RETURN (todate – fromdate – (totalsundays + totalsaturdays) / 7 – 1);
END totworkdays;

Call this function as follows:

declare
lv_tot_work_days number;
begin
lv_tot_work_days := totworkdays (’01-jan-2009′, ’31-jan-2009′);
dbms_output.put_line(‘Total Work Days: ‘||lv_tot_work_days);
end;

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