get rid of lines that are completely understood by the other lines

using oracle 10 g

I have a requirement where I have a few groups that have a start date and end date, and
I don't know how many lines per group, it is dynamic.

I need to get rid of all the lines that are completely understood by the other lines per group
To tell if an online group has started on January 1, 2000 and ending on January 1, 2001
and another group line begins February 1, 2000 and ends at 2000 1 dec
only the line Jan to Jan should appear.

so, for

with t as
(
    select 'A' grp, 1 id, to_date('01-01-2000', 'MM-DD-YYYY') start_dt, to_date('01-01-2001', 'MM-DD-YYYY') end_dt from dual union all
    select 'A' grp, 2 id, to_date('02-01-2000', 'MM-DD-YYYY') start_dt, to_date('12-01-2000', 'MM-DD-YYYY') end_dt from dual union all
    select 'A' grp, 3 id, to_date('03-01-2000', 'MM-DD-YYYY') start_dt, to_date('12-10-2000', 'MM-DD-YYYY') end_dt from dual union all
    select 'A' grp, 4 id, to_date('07-01-2000', 'MM-DD-YYYY') start_dt, to_date('01-10-2001', 'MM-DD-YYYY') end_dt from dual union all
    select 'A' grp, 5 id, to_date('01-01-2000', 'MM-DD-YYYY') start_dt, to_date('01-01-2001', 'MM-DD-YYYY') end_dt from dual 
 )

I don't want to see

GRP,ID,START_DT,END_DT
A,1,1/1/2000,1/1/2001
A,4,7/1/2000,1/10/2001

Published by: pollywog on July 20, 2010 11:49

Published by: pollywog on July 20, 2010 11:56

Published by: pollywog on July 20, 2010 11:56

Well, I do not get the exact release you do, but I'm sure that this complies with your verbal condition.

You may have a fault in your output specified? It is also quite possible, that there is something wrong with my query :)

with
   t as
(
   select 'A' grp, 1 id, to_date('01-01-2000', 'MM-DD-YYYY') start_dt, to_date('01-01-2001', 'MM-DD-YYYY') end_dt from dual union all
   select 'A' grp, 2 id, to_date('02-01-2000', 'MM-DD-YYYY') start_dt, to_date('12-01-2000', 'MM-DD-YYYY') end_dt from dual union all
   select 'A' grp, 3 id, to_date('03-01-2000', 'MM-DD-YYYY') start_dt, to_date('12-10-2000', 'MM-DD-YYYY') end_dt from dual union all
   select 'A' grp, 4 id, to_date('07-01-2000', 'MM-DD-YYYY') start_dt, to_date('01-10-2001', 'MM-DD-YYYY') end_dt from dual union all
   select 'A' grp, 5 id, to_date('01-01-2000', 'MM-DD-YYYY') start_dt, to_date('01-01-2001', 'MM-DD-YYYY') end_dt from dual union all
   select 'A' grp, 6 id ,to_date('12-25-1999', 'MM-DD-YYYY') start_dt, to_date('01-05-2001', 'MM-DD-YYYY') end_dt from dual union all
   select 'A' grp, 7 id, to_date('02-01-2001', 'MM-DD-YYYY') start_dt, to_date('02-01-2001', 'MM-DD-YYYY') end_dt from dual
)
select
   grp,
   id,
   start_dt,
   end_dt,
   last_start_dt,
   last_end_dt
from
(
   select
      lag(start_dt)   over (partition by grp order by start_dt asc)  as last_start_dt,
      lag(end_dt)     over (partition by grp order by start_dt asc)  as last_end_dt,
      grp,
      id,
      start_dt,
      end_dt
   from
      t
)
where last_start_dt is null
or
not
(
         start_dt  between last_start_dt and last_end_dt
   and   end_dt    between last_start_dt and last_end_dt
)
order by start_dt asc;

G                 ID START_DT             END_DT               LAST_START_DT        LAST_END_DT
- ------------------ -------------------- -------------------- -------------------- --------------------
A                  6 25-DEC-1999 12 00:00 05-JAN-2001 12 00:00
A                  3 01-MAR-2000 12 00:00 10-DEC-2000 12 00:00 01-FEB-2000 12 00:00 01-DEC-2000 12 00:00
A                  4 01-JUL-2000 12 00:00 10-JAN-2001 12 00:00 01-MAR-2000 12 00:00 10-DEC-2000 12 00:00
A                  7 01-FEB-2001 12 00:00 01-FEB-2001 12 00:00 01-JUL-2000 12 00:00 10-JAN-2001 12 00:00

4 rows selected.

Tags: Database

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get rid of lines that are completely understood by the other lines

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