All months in date range plus running count

Question

Oracle 11g
Hello all,
Having trouble getting the following query to return proper results. Have a table with a MEMBERNO, BUSINESS_LINE, ELIGIBILITY_START_DATE, ELIGIBILITY_END_DATE.
MEMBERNO is not unique
BUSINESS_LINE is not either
Start and end date are periods of time where: MEMBERNO&BUSINESS_LINE have changed
I need to list the member number, business_line, and each month that falls within the date range beginning with eligibility_start_date & eligibility_end_date, as well as a running count of the total in that span.
Eg.
member, business_line, month, year, count
1234, bus1, 01, 2001, 1
1234, bus1, 02, 2001, 2
1234, bus1, 03, 2001, 3
Here is my SQL, it is not sequencing the months dates correctly and I can not figure out why. Any help is very appreciated:
SELECT memberno,
business_line,
TO_CHAR (ADD_MONTHS (start_date, LEVEL - 1), 'MM') as MONTH,
TO_CHAR (ADD_MONTHS (start_date, LEVEL - 1), 'YYYY') as YEAR,
ROW_NUMBER () OVER (PARTITION BY key1 ORDER BY start_date ASC) as MEMBER_MONTH_COUNT
FROM (SELECT memberno,
business_line,
eligibility_start_date as start_date,
eligibility_end_date as end_date,
member_nbr || business_line as key1
FROM eligibility)
CONNECT BY LEVEL <=
MONTHS_BETWEEN (TRUNC (END_DATE, 'MM'),
TRUNC (START_date, 'MM'))
+ 1;
Edited by: 935047 on Jul 25, 2012 5:58 AM
Edited by: 935047 on Jul 25, 2012 6:18 AM

Answer 1

935047 wrote:
I need to list the member number, business_line, and each month that falls within the date range beginning with eligibility_start_date & eligibility_end_date, as well as a running count of the total in that span.
Eg.
member, business_line, month, year, count
1234, bus1, 01, 2001, 1
1234, bus1, 02, 2001, 2
1234, bus1, 03, 2001, 3I could not understand what the Running Count mean. Hence, I used Row_Number (Same as you did).
Below query might match yours.
with data (memb_no, bus_line, st_date, end_date) as
  select 1234, 'bus1', to_date('01-01-2001', 'MM-DD-YYYY'), to_date('06-30-2001', 'MM-DD-YYYY') from dual
  union all
  select 1234, 'bus1', to_date('07-01-2001', 'MM-DD-YYYY'), to_date('07-30-2002', 'MM-DD-YYYY') from dual
min_max as
  select memb_no, bus_line, min(st_date) st_date, max(end_date) end_date
    from data
   group by memb_no, bus_line
lvl as
  select level l
    from dual
  connect by level <= (select max(round(months_between(end_date, st_date))) from min_max)
select memb_no,
       bus_line,
       to_char(add_months(st_date, l - 1), 'MM') months,
       to_char(add_months(st_date, l - 1), 'YYYY') Year,
       row_number() over (partition by memb_no, bus_line order by st_date) cnt
  from min_max cross join lvl
order by year, months;
----OUTPUT------------------------
MEMB_NO BUS_LINE MONTHS YEAR CNT
   1234 bus1     01     2001   1
   1234 bus1     02     2001  19
   1234 bus1     03     2001   3
   1234 bus1     04     2001   4
   1234 bus1     05     2001   5
   1234 bus1     06     2001   6
   1234 bus1     07     2001   7
   1234 bus1     08     2001   8
   1234 bus1     09     2001   9
   1234 bus1     10     2001  10
   1234 bus1     11     2001  11
   1234 bus1     12     2001  12
   1234 bus1     01     2002  13
   1234 bus1     02     2002  14
   1234 bus1     03     2002  15
   1234 bus1     04     2002  16
   1234 bus1     05     2002  17
   1234 bus1     06     2002  18
   1234 bus1     07     2002   2
19 rows selected