Crystal Reports Need to Group by Derived Date Range

Question

Long time listner, first time caller. I\'m using Crystal Reports 2010.

I have daily trade information that I need to group together if the volume doesn\'t change. H

Answer 1

with w as (
     select 1 id, to_date('1/1/2012', 'mm/dd/yyyy') db, to_date('1/2/2012', 'mm/dd/yyyy') de, 500 s from dual
     union all
     select 1, to_date('1/2/2012', 'mm/dd/yyyy'), to_date('1/3/2012', 'mm/dd/yyyy'), 500 from dual
     union all
     select 1, to_date('1/3/2012', 'mm/dd/yyyy'), to_date('1/4/2012', 'mm/dd/yyyy'), 1000 from dual
     union all
     select 1, to_date('1/4/2012', 'mm/dd/yyyy'), to_date('1/5/2012', 'mm/dd/yyyy'), 750 from dual
     union all
     select 1, to_date('1/5/2012', 'mm/dd/yyyy'), to_date('1/6/2012', 'mm/dd/yyyy'), 750 from dual
     union all
     select 1, to_date('1/6/2012', 'mm/dd/yyyy'), to_date('1/7/2012', 'mm/dd/yyyy'), 500 from dual
     union all
     select 1, to_date('1/7/2012', 'mm/dd/yyyy'), to_date('1/8/2012', 'mm/dd/yyyy'), 500 from dual
     union all
     select 1, to_date('1/8/2012', 'mm/dd/yyyy'), to_date('1/9/2012', 'mm/dd/yyyy'), 510 from dual      
     )

select tmin.db, tmax.de, tmin.s
from
(     
  select 
       row_number() over (order by db) id,
           db,
           s
  from   
  ( 
      select
           db,
           s,
           case 
                  when ps is null
                       then 1
                  when ps != s
                       then row_number() over (order by db) 
               else 0 end num
       from (

           select 
                   (db)
                  , (de)
                  , lag (s,1) over (ORDER BY db) ps                
                  , s


           from w
           ) t
  ) t1
  where num != 0
 ) tmin,

 (select 
     row_number() over (order by db) id,
         de,
         s
from   
(      
    select
           db,
             de,

             s,
             case 
                when ps is null
                     then 1
                when ps != s
                     then row_number() over (order by de desc) 
             else 0 end num
     from (

         select 
                  db
                ,(de)
                , lag (s,1) over (ORDER BY de desc) ps                
                , s                

         from w
         order by db
         ) t
 ) t1
where num != 0) tmax

where tmin.id = tmax.id