sql - Oracle - Assigning the correct Date from a Set -

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i have table below 

regid  | pkg_desc  | event_date   | is_con  | is_ren ----------------------------------------------------- 1234   | cc        | 27-mar-14     |  0      |  0 1234   | cc        | 27-jun-14     |  1      |  0 1234   | gui       | 27-mar-14     |  0      |  0 1234   | gui       | 27-jun-14     |  1      |  0 1234   | gui       | 27-sept-14    |  0      |  1 1234   | gui       | 27-sept-15    |  0      |  1 1234   | remote    | 27-mar-14     |  0      |  0 1234   | remote    | 27-jun-14     |  1      |  0 1234   | remote    | 27-sept-14    |  0      |  1 2431   | cc        | 27-mar-14     |  0      |  0 2431   | cc        | 27-jun-14     |  1      |  0

i have query below 

select a.reg_id, b.sess_start_dt,  case when trunc(a.event_date) - b.sess_start_dt between 0-30 'days    0_30'  when trunc(a.event_date) - b.sess_start_dt between 31-60 'days 31-60'      tab inner join tab b on a.reg_id = b.reg_id , a.is_ren = 1    union  select a.reg_id, b.sess_start_dt,  case when trunc(a.event_date) - b.sess_start_dt between 0-30 'days    0_30'  when trunc(a.event_date) - b.sess_start_dt between 31-60 'days 31-60'      tab inner join tab b on a.reg_id = b.reg_id , a.is_con = 1

tab b contains usage each reg_id there 100's of records.. sample of few 

  regid | sess_start_dt   1234  | 27-jan-14    1234  | 20-mar-12   1234  | 27-mar-12   1234  | 01-sept-14    1234  | 07-sept-14   1234  | 29-jul-14   1234  | 03-aug-14   1234  | 27-mar-13   1234  | 27-mar-12    1234  | 27-mar-12    1234  | 27-mar-12    1234  | 27-mar-12    1234  | 27-mar-12    1234  | 27-mar-12    2431  | 20-jun-14

the above query needs corrected in way like,

1) if reg_id having @ least 1 is_ren = 1 subscription should considered renewal subscription , needs 30 days , 60 days usage table b is_ren = 1 event_date. (for regid 1234 is_ren query should execute)

2) if multiple is_ren = 1 existing each regid usage needs taken 30 days , 60 days table b min(event_date). in case usage should taken 27-sept-14 instead of 27-sept-15

3) if there no is_ren = 1 , there is_con = 1 it's considered conversion , usage should taken before 60 days converted date (for regid 2431, usage needs 60 days 27-jun-14{this event_date in query})

the o/p should like

regid     |  event_date     |   days    0_30   |  days 31-60  | code 1234      |  27-sept-14     |   2              |  2           | ren 2431      |  27-jul-14      |   1              |  0           | con

if assumptions in comment correct, may need. notice order by clause in row_number() - first rows is_ren = 1, rows is_ren = 0 , is_con = 1, other rows, , within each group order event_date ascending. way, top row (rn = 1), 1 use in outer query, have is_ren = 1 earliest possible date, or if no is_ren = 1 row is_con = 1 , earliest date, or else earliest date. (in last case, code null: means there no is_ren = 1 , no is_con = 1 regid.

not sure why have 27-jul-14 in output regid = 2431, should 27-jun-14. also, there no four-letter months in oracle ("sept"). output shows dates using session parameters; if need format dates, use to_date(event_date, .....) desired date format model. also, since data provided dates (with no time-of-day component), didn't truncate anything; may need to, if real data has time-of-day components.

with      table_a ( regid, pkg_desc, event_date, is_con, is_ren ) (        select 1234, 'cc'    , to_date ('27-mar-14', 'dd-mon-rr'), 0, 0 dual union        select 1234, 'cc'    , to_date ('27-jun-14', 'dd-mon-rr'), 1, 0 dual union        select 1234, 'gui'   , to_date ('27-mar-14', 'dd-mon-rr'), 0, 0 dual union        select 1234, 'gui'   , to_date ('27-jun-14', 'dd-mon-rr'), 1, 0 dual union        select 1234, 'gui'   , to_date ('27-sep-14', 'dd-mon-rr'), 0, 1 dual union        select 1234, 'gui'   , to_date ('27-sep-15', 'dd-mon-rr'), 0, 1 dual union        select 1234, 'remote', to_date ('27-mar-14', 'dd-mon-rr'), 0, 0 dual union        select 1234, 'remote', to_date ('27-jun-14', 'dd-mon-rr'), 1, 0 dual union        select 1234, 'remote', to_date ('27-sep-14', 'dd-mon-rr'), 0, 1 dual union        select 2431, 'cc'    , to_date ('27-mar-14', 'dd-mon-rr'), 0, 0 dual union        select 2431, 'cc'    , to_date ('27-jun-14', 'dd-mon-rr'), 1, 0 dual      ),      table_b ( regid, sess_start_dt ) (        select 1234, to_date ('27-jan-14', 'dd-mon-rr') dual union        select 1234, to_date ('20-mar-12', 'dd-mon-rr') dual union        select 1234, to_date ('27-mar-12', 'dd-mon-rr') dual union        select 1234, to_date ('01-sep-14', 'dd-mon-rr') dual union        select 1234, to_date ('07-sep-14', 'dd-mon-rr') dual union        select 1234, to_date ('29-jul-14', 'dd-mon-rr') dual union        select 1234, to_date ('03-aug-14', 'dd-mon-rr') dual union        select 1234, to_date ('27-mar-13', 'dd-mon-rr') dual union        select 1234, to_date ('27-mar-12', 'dd-mon-rr') dual union        select 1234, to_date ('27-mar-12', 'dd-mon-rr') dual union        select 1234, to_date ('27-mar-12', 'dd-mon-rr') dual union        select 1234, to_date ('27-mar-12', 'dd-mon-rr') dual union        select 1234, to_date ('27-mar-12', 'dd-mon-rr') dual union        select 1234, to_date ('27-mar-12', 'dd-mon-rr') dual union        select 2431, to_date ('20-jun-14', 'dd-mon-rr') dual      ),      prep ( regid, event_date, code, rn ) (        select regid, event_date,               case when is_ren = 1 'ren' when is_con = 1 'con' else null end,               row_number() on (partition regid                                   order case when is_ren = 1 0                                                when is_con = 1 1 else 2 end,                                   event_date)          table_a      ) select p.regid, p.event_date,        count(case when b.sess_start_dt between p.event_date - 30 , p.event_date                                                             1 end) days_0_30,        count(case when b.sess_start_dt between p.event_date - 60 , p.event_date - 31                                                              1 end) days_31_60,        p.code   prep p inner join table_b b on p.regid = b.regid  rn = 1 group p.regid, p.event_date, p.code ;

output:

     regid event_date           days_0_30 days_31_60 cod ---------- ------------------- ---------- ---------- ---       1234 2014-09-27 00:00:00          2          2 ren       2431 2014-06-27 00:00:00          1          0 con

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