How to add extra per day records based on maximum occurances in the week.

Question

Hello,
I need to add extra records based on maximum occurances on a day in a week.
For example, the result of the query shows that maximum occuances in a week 0 is 3 on so I need to add empty records in each day in that week.
SQL QUERY:
with  numbers as (
SELECT ROWNUM N FROM dual 
  CONNECT BY LEVEL <=35
),months as (
SELECT     ADD_MONTHS('01-JUN-10',n-1) AS current_month,
     TO_CHAR(ADD_MONTHS('01-JUN-10',n-1),'fmMonth-YYYY') AS current_month_label
FROM numbers
WHERE ADD_MONTHS('01-JUN-10',n-1) <= NVL(add_months('01-JUN-10', :monthcount-1),:p_month)
ORDER BY n ASC
) , dates as (
select     trunc(trunc(m.current_month, 'MM'), 'D') + n - 1 calendar_date,
     trunc((n - 1) / 7) AS week_num,
                m.current_month as current_month
from     numbers, months m
where trunc(dom.schedule.calendar_begin(m.current_month) + n - 1, 'd') <= last_day(m.current_month)
Order By week_num, calendar_date
select dates.week_num, edate, name from (
--week 0
select '30-MAY-10' as edate, 'JJ' as name from dual union
select  '31-MAY-10' as edate, 'MK' as name from dual union
select  '01-JUN-10' as edate, 'MK' as name from dual union
select  '01-JUN-10' as edate, 'BK' as name from dual union
select  '01-JUN-10' as edate, 'JJ' as name from dual union
select  '04-JUN-10' as edate, 'KK' as name from dual union
select  '04-JUN-10' as edate, 'LA' as name from dual      union
-- week 1
select  '06-JUN-10' as edate, 'BK' as name from dual union
select  '06-JUN-10' as edate, 'JJ' as name from dual union
select  '07-JUN-10' as edate, 'KK' as name from dual union
select  '11-JUN-10' as edate, 'LA' as name from dual      
) a  join dates on dates.calendar_date = a.edate   
order by week_num, to_date(edate);CURRENT RESULT :
WEEK_NUM             EDATE                NAME
0                   30-MAY-10            JJ
0                   31-MAY-10             MK
0                   01-JUN-10             MK
0                   01-JUN-10             JJ
0                   01-JUN-10             BK
0                   04-JUN-10             KK
0                   04-JUN-10             LA
1                   06-JUN-10             BK
1                   06-JUN-10             JJ
1                   07-JUN-10             KK
1                   11-JUN-10             LAREQUIRED RESULT:
WEEK_NUM             EDATE                NAME
0                   30-MAY-10             JJ
0                   30-MAY-10            null
0                   30-MAY-10            null
0                   31-MAY-10            MK
0                   31-MAY-10            null
0                   31-MAY-10            null
0                   01-JUN-10             BK
0                   01-JUN-10              JJ
0                   01-JUN-10             MK
0                   02-JUN-10             null
0                   02-JUN-10             null
0                   02-JUN-10             null
0                   03-JUN-10             null
0                   03-JUN-10             null
0                   03-JUN-10             null
0                   04-JUN-10             KK
0                   04-JUN-10             LA
0                   04-JUN-10             null
0                   05-JUN-10             null
0                   05-JUN-10             null
0                   05-JUN-10             null
--Number of Week 1 records should be 14 = (max occurances on 06-JUN-10)  * 7
1                   06-JUN-10             BK
1                   06-JUN-10             JJ
1                   07-JUN-10             KK
1                   07-JUN-10             null
1                   08-JUN-10             null
1                   08-JUN-10             null
1                   09-JUN-10             null
1                   09-JUN-10             null
1                   10-JUN-10             null
1                   10-JUN-10             null
1                   11-JUN-10             LA
1                   11-JUN-10             null
1                   12-JUN-10             null
1                   12-JUN-10             nullI would appreciate it if you could help me to find efficient way to achieve this?
Thanks,
GM
Edited by: user12068331 on Sep 28, 2010 2:17 PM
Edited by: user12068331 on Sep 28, 2010 2:48 PM

Answer 1

Ok,
Few things to clarify first :
1 - How do you define week number ?
Oracle has 2 different way for week number : normal week number (WW) and isoweek (IW).
is your weeknumber one of those, or is it something else ?
2 - Depending on the country the week doesn't start on the same day : in France (as most of Europe I think) first day is monday, where in the USA (as far as I know) first day is sunday.
the to_char builtin function can display weeknumber :with a as (
--week 0
select 0 as weeknum, to_date('30-MAY-2010','DD-MON-YYYY') as edate, 'JJ' as name from dual union all
select 0 as weeknum, to_date('31-MAY-2010','DD-MON-YYYY') as edate, 'MK' as name from dual union all
select 0 as weeknum, to_date('01-JUN-2010','DD-MON-YYYY') as edate, 'MK' as name from dual union all
select 0 as weeknum, to_date('01-JUN-2010','DD-MON-YYYY') as edate, 'BK' as name from dual union all
select 0 as weeknum, to_date('01-JUN-2010','DD-MON-YYYY') as edate, 'JJ' as name from dual union all
select 0 as weeknum, to_date('04-JUN-2010','DD-MON-YYYY') as edate, 'KK' as name from dual union all
select 0 as weeknum, to_date('04-JUN-2010','DD-MON-YYYY') as edate, 'LA' as name from dual union all
-- week 1
select 1 as weeknum, to_date('06-JUN-2010','DD-MON-YYYY') as edate, 'BK' as name from dual union all
select 1 as weeknum, to_date('06-JUN-2010','DD-MON-YYYY') as edate, 'JJ' as name from dual union all
select 1 as weeknum, to_date('07-JUN-2010','DD-MON-YYYY') as edate, 'KK' as name from dual union all
select 1 as weeknum, to_date('11-JUN-2010','DD-MON-YYYY') as edate, 'LA' as name from dual
select to_char(a.edate,'IW') isoweek, to_char(a.edate,'WW') numweek, a.*
from a;
IS NU    WEEKNUM EDATE                          NA
21 22          0 Sunday    30/05/2010 00:00:00  JJ
22 22          0 Monday    31/05/2010 00:00:00  MK
22 22          0 Tuesday   01/06/2010 00:00:00  MK
22 22          0 Tuesday   01/06/2010 00:00:00  BK
22 22          0 Tuesday   01/06/2010 00:00:00  JJ
22 23          0 Friday    04/06/2010 00:00:00  KK
22 23          0 Friday    04/06/2010 00:00:00  LA
22 23          1 Sunday    06/06/2010 00:00:00  BK
22 23          1 Sunday    06/06/2010 00:00:00  JJ
23 23          1 Monday    07/06/2010 00:00:00  KK
23 24          1 Friday    11/06/2010 00:00:00  LA
11 rows selected.