Sum by Date

Question

Hello,
I have a table that has an end_of_week column along with sunday,monday,tuesday,wednesday,thursday,friday,saturday columns.
I want to be able to query the data based on any date I input(not necessarily the end_of_week date) and have the sum of the days return.
For example:
End_of_week  sunday  monday    tuesday    wednesday   thursday    friday      saturday
08/20/2011    15     5         5          1           2           3           1
08/27/2011    0      12        2          0           0           0           0select sum(sunday + monday+ tuesday+wednesday+thursday+friday +saturday)
where end_of_week between '08/16/2011' and '08/27/2011'
This returns the wrong data because it does not recognize the days at dates.It sums sunday - saturday and not the 16th(tuesday) to the 27th.
Any help is appreciated.

Answer 1

var start_date varchar2(10);
var end_date varchar2(10);
begin
  :start_date := '08/16/2011';
  :end_date := '08/27/2011';
end;
select sum(case when end_of_week - 6 between to_date(:start_date,'mm/dd/yyyy') and
                                             to_date(:end_date,'mm/dd/yyyy')
                then sunday
                else 0
           end +
           case when end_of_week - 5 between to_date(:start_date,'mm/dd/yyyy') and
                                             to_date(:end_date,'mm/dd/yyyy')
                then monday
                else 0
           end +
           case when end_of_week - 4 between to_date(:start_date,'mm/dd/yyyy') and
                                            to_date(:end_date,'mm/dd/yyyy')
                then tuesday
                else 0
           end +
           case when end_of_week - 3 between to_date(:start_date,'mm/dd/yyyy') and
                                            to_date(:end_date,'mm/dd/yyyy')
                then wednesday
                else 0
           end +
           case when end_of_week - 2 between to_date(:start_date,'mm/dd/yyyy') and
                                            to_date(:end_date,'mm/dd/yyyy')
                then thursday
                else 0
           end +
           case when end_of_week - 1 between to_date(:start_date,'mm/dd/yyyy') and
                                            to_date(:end_date,'mm/dd/yyyy')
                then friday
                else 0
           end +
           saturday)
  from week_table
where end_of_week between to_date(:start_date,'mm/dd/yyyy') and to_date(:end_date,'mm/dd/yyyy');