How to get sum of bugs for particular Mnth and particular Year dynamically?

Question

Hi All,
I've a query related to dynamic date and year :
select bug_id,
category,
count(*) Total_bugs,
SUM(CASE when bug_date >= '10/1/2011' and bug_date <= '10/31/2011' Then 1 else 0 end) OCT_11,
SUM(CASE when bug_date >= '9/1/2011' and bug_date<= '9/30/2011' Then 1 else 0 end) SEP_11,
FROM AA_BUG_TBL
GROUP BY BUG_ID,BUG_CATEGORY
In the above query,Can we write one sum statement to get sum of bugs for a particular month and particular year dynamically?
for ex:2 bugs between 10/1/2011 and 10/31/2011 then 2 under oct_11
5 bugs between 09/01/11 and 09/30/2011 then 5 under sep_11
In this case we need to calculate correct no of days for feb
Thanks,
Mahender.

Answer 1

So...
You need to iterate based on something like the month, quarter, year... Then query on that. I'll use a "WITH" clause to illustrate:
with my_bugs as
    select bug_id
         , bug_date
         , case when to_char ( bug_date, 'QYYYY' ) = '12009' then 1 else 0 end y2009q1_bug
         , case when to_char ( bug_date, 'QYYYY' ) = '22009' then 1 else 0 end y2009q2_bug
         , case when to_char ( bug_date, 'QYYYY' ) = '32009' then 1 else 0 end y2009q3_bug
         , case when to_char ( bug_date, 'QYYYY' ) = '42009' then 1 else 0 end y2009q4_bug
         , case when to_char ( bug_date, 'YYYY' ) = 2009 then 1 else 0 end y2009_bug
         , case when to_char ( bug_date, 'YYYY' ) = 2010 then 1 else 0 end y2010_bug
         , case when to_char ( bug_date, 'YYYY' ) = 2011 then 1 else 0 end y2011_bug
         , case when 1 = 1 then 1 else 0 end is_bug_flag
      from bugs
  select bug_id
       , bug_date
       , sum   ( y2009q1_bug ) over () as total_bugs_2009q1
       , sum   ( y2009q2_bug ) over () as total_bugs_2009q2
       , sum   ( y2009q3_bug ) over () as total_bugs_2009q3
       , sum   ( y2009q4_bug ) over () as total_bugs_2009q4
       , sum   ( y2009_bug   ) over () as total_bugs_2009
       , count (*)             over ( partition by is_bug_flag ) as total_bugs
    from my_bugsI mocked up some data so my results will be drastically different than yours but here are the results:
    BUG_ID BUG_DATE  TOTAL_BUGS_2009Q1 TOTAL_BUGS_2009Q2 TOTAL_BUGS_2009Q3 TOTAL_BUGS_2009Q4 TOTAL_BUGS_2009 TOTAL_BUGS
      2014 10-SEP-10                 0                 0               114              1143         1257         10000
      2015 14-APR-10                 0                 0               114              1143         1257         10000
      2016 30-NOV-09                 0                 0               114              1143         1257         10000
      2017 03-JUN-11                 0                 0               114              1143         1257         10000
      2018 29-DEC-10                 0                 0               114              1143         1257         10000
      2019 12-JAN-11                 0                 0               114              1143         1257         10000
      2020 21-APR-10                 0                 0               114              1143         1257         10000
      2021 12-JAN-11                 0                 0               114              1143         1257         10000
      2022 29-NOV-10                 0                 0               114              1143         1257         10000
      2023 20-JUL-11                 0                 0               114              1143         1257         10000
      2024 04-MAR-11                 0                 0               114              1143         1257         10000