Re: Complex Query

Hi michel,

Thanks for the reply. AS I am a newbie in oracle, at first the code looked a bit confusing. Can you pls. explain a little about the SQL.

TIA
Sameer
"Michel Cadot" <micadot{at}altern{dot}org> wrote in message news:<40229d6b$0$294$636a15ce_at_news.free.fr>...
> "Sameer" <sameer794_at_rediffmail.com> a écrit dans le message de
> news:2ca69ec3.0402050544.21270566_at_posting.google.com...
> > Hi There,
> >
> > I am facing a problem in writing a query/PL-SQL procedure for the
> > following. We have a requirement to list the month-wise count of
> > resolved and pending fraud cases for the last 6 months. Our table
> > contains the columns case_id, start_date, end_date along with some
> > other columns and the business rules as are as follows.
> >
> > If a case has been opened and resolved in the same month, then it is
> > counted as a resolved case, otherwise it is 'pending' for the month in
> > which it has been started and the following months, until it is
> > 'resolved' in the month in which it has been closed.
> >
> > For ex, Consider the following.
> > 1. case1 has been opened on 1Apr2003 and closed on 2May2003
> > 2. case2 has been opened on 15Apr2003 and closed on 20Apr2003
> > 3. case3 has been opened on 1May2003 and closed on 3Aug2003.
> >
> > So when I run a query in Oct2003, result should be as below:
> >
> > Apr May Jun July Aug Sept
> > Resolved 1(case2) 1(case1) 0 0 1 0
> > Pending 1(case1) 1(case3) 1(case3) 1(case3) 0 0
> >
> > we need to show the count only. the case_id has been mentioned just
> > for understanding.
> >
> > Hope I sound clear;-)
> > reply asap
> >
> > TIA,
> > Sameer
>
>
> Just for fun:
>
> SQL> create table test (case_id number, start_date date, end_date date);
>
> Table created.
>
> SQL> insert into test values (1, to_date('04/01/2003','MM/DD/YYYY'),
> 2 to_date('05/02/2003','MM/DD/YYYY'));
> SQL> insert into test values (2, to_date('04/15/2003','MM/DD/YYYY'),
> 2 to_date('04/20/2003','MM/DD/YYYY'));
> SQL> insert into test values (3, to_date('05/01/2003','MM/DD/YYYY'),
> 2 to_date('08/03/2003','MM/DD/YYYY'));
> SQL> commit;
> SQL> select * from test;
>
> CASE_ID START_DATE END_DATE
> ---------- ---------- ----------
> 1 04/01/2003 05/02/2003
> 2 04/15/2003 04/20/2003
> 3 05/01/2003 08/03/2003
>
> 3 rows selected.
>
> SQL> def cur_date='10/15/2003'
> SQL> select to_char(add_months(to_date('&cur_date','MM/DD/YYYY'),cnt.nmonth),'Mon YYYY') Month,
> 2 count(*) nb_case,
> 3 sum(decode(sign(nvl(t1.end_date,to_date('12/31/2999','MM/DD/YYYY'))
> 4 - trunc(add_months(to_date('&cur_date','MM/DD/YYYY'),cnt.nmonth+1),
> 5 'MONTH')), -1,
> 6 decode(sign(nvl(t1.end_date,to_date('12/31/2999','MM/DD/YYYY'))
> 7 - trunc(add_months(to_date('&cur_date','MM/DD/YYYY'),cnt.nmonth)-1,
> 8 'MONTH')),
> 9 1, 1 /* Resolved during the month */, 0 /* Resolved before */),
> 10 0 /* Not resolved or resolved after */)) resolved,
> 11 count(*)
> 12 - sum(decode(sign(nvl(t1.end_date,to_date('12/31/2999','MM/DD/YYYY'))
> 13 - trunc(add_months(to_date('&cur_date','MM/DD/YYYY'),cnt.nmonth+1),
> 14 'MONTH')), -1, 1 /* Resolved */, 0 /* Pending */))
> 15 pending
> 16 from ( select -1*rownum nmonth
> 17 from (Select 1 from dual group by cube(1,2,3,4))
> 18 where rownum < to_number(to_char(to_date('&cur_date','MM/DD/YYYY'),'MM'))
> 19 order by rownum desc ) cnt,
> 20 test t1
> 21 where trunc(t1.start_date,'MM') < add_months(to_date('&cur_date','MM/DD/YYYY'),cnt.nmonth)
> 22 group by cnt.nmonth
> 23 /
>
> MONTH NB_CASE RESOLVED PENDING
> -------- ---------- ---------- ----------
> Apr 2003 2 1 1
> May 2003 3 1 1
> Jun 2003 3 0 1
> Jul 2003 3 0 1
> Aug 2003 3 1 0
> Sep 2003 3 0 0
>
> 6 rows selected.
>
> Regards
> Michel Cadot
Received on Fri Feb 06 2004 - 04:08:31 CST