Number of a day occurence in a range of dates

Question

Hi
I had a requirement of counting the number of times a particular day occurs between two dates.
For eg., Tuesday comes 9 times betweeen '01-mar-2008' and '15-apr-2008'
I have written the below function for it and it gives the desired output.
But am looking for a better logic, may be directly getting the count through a query instead of a function.
create or replace function day_occurance ( from_date date, to_date date) RETURN NUMBER is
   occ_day NUMBER := 3;
   from_weekday  NUMBER;
   ctr number := 0;
   temp_date date;
begin
   temp_date := from_date;
   while (temp_date <= to_date) loop
      from_weekday := to_char(temp_date, 'd');
      IF (from_weekday = occ_day) THEN
        ctr := ctr + 1;
      END IF;
      temp_date := temp_date + 1;     
   end loop;
   return ctr;
end;Thanks in advance.
Piks
null

Answer 1

like this ?
SQL> select count(*) from (
  2  select to_date('01-03-2008', 'DD-MM-YYYY') + rownum - 1 dt from dual
  3  connect by level <= to_date('15-04-2008', 'DD-MM-YYYY') - to_date('01-03-2008', 'DD-MM-YYYY') + 1)
  4  where trim(to_char(dt, 'DAY')) = 'TUESDAY' ;
  COUNT(*)
         7