Need working days for all months in a given year

Question

Hi,
I need no of working days for all the months in a given year.
(i.e year is the input and the query should return 12 columns(jan-dec). Saturday and Sunday are holidays)
Regards,
Vignesh

Answer 1

Maybe you can use this:
break on month skip 1
set linesize 200
set pagesize 2000
column month format a20
column week format a4
with req as (select '&Required_Year_YYYY' as yr from dual)
    ,offset as (select case when to_char(trunc(to_date(yr,'YYYY'),'YYYY'),'IW') in ('52','53') then 1 else 0 end as offset from req)
select lpad( Month, 20-(20-length(month))/2 ) month,
       '('||week||')' as week, "Mo", "Tu", "We", "Th", "Fr", "Sa", "Su"
from (
  select to_char(dt,'fmMonth YYYY') month,
  case when to_char(dt, 'mm') = '12' and to_char(dt,'iw') = '01' and offset = 0 then '53'
       when to_char(dt, 'mm') = '12' and to_char(dt,'iw') = '01' and offset = 1 then '54'
       when to_char(dt, 'mm') = '01' and to_char(dt,'iw') in ('52','53') then '1'
       else to_char(to_number(to_char(dt,'iw'))+offset) end as week,
  max(decode(to_char(dt,'d'),'1',lpad(to_char(dt,'fmdd'),2))) "Su",
  max(decode(to_char(dt,'d'),'2',lpad(to_char(dt,'fmdd'),2))) "Mo",
  max(decode(to_char(dt,'d'),'3',lpad(to_char(dt,'fmdd'),2))) "Tu",
  max(decode(to_char(dt,'d'),'4',lpad(to_char(dt,'fmdd'),2))) "We",
  max(decode(to_char(dt,'d'),'5',lpad(to_char(dt,'fmdd'),2))) "Th",
  max(decode(to_char(dt,'d'),'6',lpad(to_char(dt,'fmdd'),2))) "Fr",
  max(decode(to_char(dt,'d'),'7',lpad(to_char(dt,'fmdd'),2))) "Sa"
  from ( select trunc(to_date(req.yr,'YYYY'),'y')-1+rownum dt
         from all_objects, req
         where rownum <= add_months(trunc(to_date(req.yr,'YYYY'),'y'),12) - trunc(to_date(req.yr,'YYYY'),'y') )
      ,offset
  group by to_char(dt,'fmMonth YYYY'),     case when to_char(dt, 'mm') = '12' and to_char(dt,'iw') = '01' and offset = 0 then '53'
                                                when to_char(dt, 'mm') = '12' and to_char(dt,'iw') = '01' and offset = 1 then '54'
                                                when to_char(dt, 'mm') = '01' and to_char(dt,'iw') in ('52','53') then '1'
                                                else to_char(to_number(to_char(dt,'iw'))+offset) end
  ) x
order by to_date( month, 'Month YYYY' ), to_number(x.week)
/ L.