Create multiple rows based off a date range - oracle11g

Question

I have a calendar query and a table below. I have a StartDate and end date for a member. Also on my calendar table I have captured a "Weekof" based on the startDate. I would like to capture if a member is active anytime during that weekof. See expected results.
SELECT DISTINCT
--CA.CALENDAR_DATE,
TO_CHAR(CALENDAR_DATE,'MM/DD/YYYY') AS CALENDAR_DATE
TO_CHAR(NEXT_DAY(CALENDAR_DATE, 'Monday') - 7, 'MM/DD/YY-') ||
TO_CHAR(NEXT_DAY(CALENDAR_DATE, 'Monday') - 1, 'MM/DD/YY') AS WEEK_OF_YEAR,
ROW_NUMBER () OVER ( ORDER BY CALENDAR_DATE) AS MasterCalendar_RNK
FROM CALENDAR CA
WHERE 1=1
--AND CA.CALENDAR_DATE BETWEEN ADD_MONTHS(TRUNC(SYSDATE), -12) AND TRUNC(SYSDATE)
--AND CA.CALENDAR_DATE BETWEEN TRUNC(SYSDATE) -5 AND TRUNC(SYSDATE)
ORDER BY TO_DATE(CALENDAR_DATE,'MM/DD/YYYY') DESC
Table
Member StartDate EndDate
A 1/31/17
B 2/1/17 2/15/17
Expected output:
Member StartDate EndDate Week_Of_Year Active
A 1/31/17 1/30/17-2/5/17 1
A 1/31/17 2/6/17-2/12/17 1
A 1/31/17 2/13/17-2/19/17 1
B 2/1/17 2/15/17 1/30/17/2/5/17 1
B 2/1/17 2/15/17 2/6/17-2/12/17 1
B 2/1/17 2/15/17 2/13/17-2/19/17 1
Current Query:
WITH MASTER_CALENDAR AS (
SELECT TRUNC(SYSDATE) + 1 - LEVEL , A.CALENDAR_DATE
FROM (SELECT C.CALENDAR_DATE FROM MST.CALENDAR C WHERE 1=1 AND C.CALENDAR_DATE > SYSDATE-30 AND C.CALENDAR_DATE < SYSDATE) A
WHERE 1=1
CONNECT BY LEVEL <= 1 --NEED TO UPDATE?
ORDER BY A.CALENDAR_DATE DESC
),
ActiveMembers AS (
SELECT H.CLT_CLT_PGMID, H.START_DT
,CASE WHEN TRUNC(H.END_DT) = '1-JAN-3000'
THEN SYSDATE
ELSE TO_DATE(H.END_DT)
END AS END_DT
FROM H
WHERE 1=1
AND H.CLT_CLT_PGMID IN ('1','2','3')
)
SELECT CLT_CLT_PGMID, STARTDATE, ENDDATE, WEEK_OF_YEAR, ACTIVE -- but not week_start
FROM (
SELECT DISTINCT A.CLT_CLT_PGMID,
TO_CHAR(A.START_DT, 'MM/DD/YY') AS STARTDATE,
TO_CHAR(A.END_DT, 'MM/DD/YY') AS ENDDATE,
NEXT_DAY(CAL.CALENDAR_DATE, 'Monday') - 7 AS WEEK_START, -- for ordering later
TO_CHAR(NEXT_DAY(CAL.CALENDAR_DATE, 'Monday') - 7, 'MM/DD/YY-') ||
TO_CHAR(NEXT_DAY(CAL.CALENDAR_DATE, 'Monday') - 1, 'MM/DD/YY') AS WEEK_OF_YEAR,
1 AS ACTIVE
FROM ActiveMembers A
INNER JOIN MASTER_CALENDAR CAL ON CAL.CALENDAR_DATE BETWEEN A.START_DT AND A.END_DT
--BETWEEN TO_CHAR(A.START_DT,'MM/DD/YYYY') AND COALESCE(A.END_DT,(SYSDATE))
)
WHERE 1=1
ORDER BY
CLT_CLT_PGMID , STARTDATE, ENDDATE, WEEK_START
;

Answer 1

Since the calendar query currently generates strings, it would be simpler to go back to the calendar table, join that to your member/date table, and regenerate the week range string:
With CTEs to represent your calendar table (just with dates for the last few weeks for now) and member data:
with calendar(calendar_date) as (
select trunc(sysdate) + 1 - level from dual connect by level <= 42
),
mytable (member, startdate, enddate) as (
select cast('A' as varchar2(6)), date '2017-01-31', cast (null as date) from dual
union all select cast('B' as varchar2(6)), date '2017-02-01', date '2017-02-15' from dual
)
select member, startdate, enddate, week_of_year, active -- but not week_start
from (
select distinct m.member,
to_char(m.startdate, 'MM/DD/YY') as startdate,
to_char(m.enddate, 'MM/DD/YY') as enddate,
next_day(c.calendar_date, 'Monday') - 7 as week_start, -- for ordering later
to_char(next_day(c.calendar_date, 'Monday') - 7, 'MM/DD/YY-') ||
to_char(next_day(c.calendar_date, 'Monday') - 1, 'MM/DD/YY') as week_of_year,
1 as active
from mytable m
join calendar c
on c.calendar_date between m.startdate and coalesce(m.enddate, trunc(sysdate))
)
order by member, startdate, enddate, week_start;
gets
MEMBER STARTDAT ENDDATE WEEK_OF_YEAR ACTIVE
------ -------- -------- ----------------- ----------
A 01/31/17 01/30/17-02/05/17 1
A 01/31/17 02/06/17-02/12/17 1
A 01/31/17 02/13/17-02/19/17 1
A 01/31/17 02/20/17-02/26/17 1
B 02/01/17 02/15/17 01/30/17-02/05/17 1
B 02/01/17 02/15/17 02/06/17-02/12/17 1
B 02/01/17 02/15/17 02/13/17-02/19/17 1
You haven't specified an upper limit for members with no end-date, so I've used today, via coalesce().
The inner query is only needed for ordering, as the week range string can't be used, and you don't want to see the week start on its own; and you can't use distinct and order by a field you aren't selecting.

Answer 2

I'd do this in a similar way to Alex, but slightly different. Seeing as your weeks start with a Monday, I'd use TRUNC(dt, 'iw') to get the ISO start of the week (which happens to be defined as a Monday) for the specified date. Then I'd get the distinct values of those before joining to your table, like so:
with calendar as (select trunc(sysdate) - level + 1 calendar_date
from dual
connect by level <= 50),
your_table as (select 'A' member, date '2017-01-31' startdate, NULL enddate from dual union all
select 'B' member, date '2017-02-01' startdate, date '2017-02-15' enddate from dual)
select yt.member,
yt.startdate,
yt.enddate,
to_char(c.week_start, 'mm/dd/yyyy')
|| ' - ' || to_char(c.week_start + 6, 'mm/dd/yyyy') week_of_year,
1 as active
from your_table yt
inner join (select distinct trunc(cl.calendar_date, 'iw') week_start
from calendar cl) c on c.week_start <= nvl(yt.enddate, SYSDATE) AND c.week_start + 6 >= yt.startdate
order by yt.member,
c.week_start;
MEMBER STARTDATE ENDDATE WEEK_OF_YEAR ACTIVE
------ ---------- ---------- ----------------------- ----------
A 01/31/2017 01/30/2017 - 02/05/2017 1
A 01/31/2017 02/06/2017 - 02/12/2017 1
A 01/31/2017 02/13/2017 - 02/19/2017 1
A 01/31/2017 02/20/2017 - 02/26/2017 1
B 02/01/2017 02/15/2017 01/30/2017 - 02/05/2017 1
B 02/01/2017 02/15/2017 02/06/2017 - 02/12/2017 1
B 02/01/2017 02/15/2017 02/13/2017 - 02/19/2017 1
Like Alex, I've assumed your null enddate runs up until today (sysdate). However, looking at your results for member B, it looks like you're looking for an overlapping range (since 30th Jan is not between 1st and 15th Feb), so I've amended my join clause accordingly. This results in an extra row for member A, so maybe you're wanting to run null enddates up until the previous Sunday of sysdate? Not sure. I'm sure you'll be able to amend that yourself, if you need to.