How to aggregate groups on a timeline

Question

Hi
I have a table with rowdata based on time.
I want to COUNT(*) multiple occurrences, while the charge is the same.
If tcharge is changed a new group count() is started.
The groups must be in the same sequence as the loggdate.
Example:
select LOGGDATE_HEAD,CHARGE from PHF_VIEW order by LOGGDATE_HEAD;
LOGGDATE_ CHARGE
13-JAN-08 CN064707
13-JAN-08 CN064707
13-JAN-08 CN064707
13-JAN-08 CN064707
13-JAN-08 CN064708
13-JAN-08 CN064708
13-JAN-08 CN064708
13-JAN-08 CN064707
13-JAN-08 CN064707
13-JAN-08 CN064707
13-JAN-08 CN064707
13-JAN-08 CN064707
13-JAN-08 CN064709
13-JAN-08 CN064709
13-JAN-08 CN064709
13-JAN-08 CN064709
13-JAN-08 CN064707
13-JAN-08 CN064707
The information should be presented like:
CHARGE COUNT(*)
CN064707 4
CN064708 3
CN064707 5
CN064709 4
CN064707 2
Any suggestions?

Answer 1

SQL> create table phf_view (loggdate_head,charge)
  2  as
  3  select to_date('13-01-2008 01:00:00','dd-mm-yyyy hh24:mi:ss'), 'CN064707' from dual union all
  4  select to_date('13-01-2008 02:00:00','dd-mm-yyyy hh24:mi:ss'), 'CN064707' from dual union all
  5  select to_date('13-01-2008 03:00:00','dd-mm-yyyy hh24:mi:ss'), 'CN064707' from dual union all
  6  select to_date('13-01-2008 04:00:00','dd-mm-yyyy hh24:mi:ss'), 'CN064707' from dual union all
  7  select to_date('13-01-2008 05:00:00','dd-mm-yyyy hh24:mi:ss'), 'CN064708' from dual union all
  8  select to_date('13-01-2008 06:00:00','dd-mm-yyyy hh24:mi:ss'), 'CN064708' from dual union all
  9  select to_date('13-01-2008 07:00:00','dd-mm-yyyy hh24:mi:ss'), 'CN064708' from dual union all
10  select to_date('13-01-2008 08:00:00','dd-mm-yyyy hh24:mi:ss'), 'CN064707' from dual union all
11  select to_date('13-01-2008 09:00:00','dd-mm-yyyy hh24:mi:ss'), 'CN064707' from dual union all
12  select to_date('13-01-2008 10:00:00','dd-mm-yyyy hh24:mi:ss'), 'CN064707' from dual union all
13  select to_date('13-01-2008 11:00:00','dd-mm-yyyy hh24:mi:ss'), 'CN064707' from dual union all
14  select to_date('13-01-2008 12:00:00','dd-mm-yyyy hh24:mi:ss'), 'CN064707' from dual union all
15  select to_date('13-01-2008 13:00:00','dd-mm-yyyy hh24:mi:ss'), 'CN064709' from dual union all
16  select to_date('13-01-2008 14:00:00','dd-mm-yyyy hh24:mi:ss'), 'CN064709' from dual union all
17  select to_date('13-01-2008 15:00:00','dd-mm-yyyy hh24:mi:ss'), 'CN064709' from dual union all
18  select to_date('13-01-2008 16:00:00','dd-mm-yyyy hh24:mi:ss'), 'CN064709' from dual union all
19  select to_date('13-01-2008 17:00:00','dd-mm-yyyy hh24:mi:ss'), 'CN064707' from dual union all
20  select to_date('13-01-2008 18:00:00','dd-mm-yyyy hh24:mi:ss'), 'CN064707' from dual
21  /
Tabel is aangemaakt.
SQL> select charge
  2       , count(*)
  3    from (  select charge
  4                 , sum(new_group_indicator) over (order by loggdate_head) grp
  5              from ( select loggdate_head
  6                          , charge
  7                          , case lag(charge) over (order by loggdate_head)
  8                            when charge then 0
  9                            else 1
10                            end new_group_indicator
11                       from phf_view p
12                   )
13         )
14   group by grp
15       , charge
16   order by grp
17  /
CHARGE     COUNT(*)
CN064707          4
CN064708          3
CN064707          5
CN064709          4
CN064707          2
5 rijen zijn geselecteerd.Regards,
Rob.