Distributing data between given date range

Hi,

Let’s assume I have table like below columns & related values.

Datebegin can start with any month(& year) & DateEnd could be end with any month(&year)

But, here I am doing ascending order with datebegin.

Data Available:

MemberID          PlanId                   DateBegin                                      DateEnd

1234                         20         2009-10-01 00:00:00.000                2010-03-31 00:00:00.000

1234                         20         2010-04-01 00:00:00.000                2011-05-31 00:00:00.000

1234                         20         2011-06-01 00:00:00.000                2011-08-31 00:00:00.000

1234                          1           2012-07-01 00:00:00.000                2029-12-31 00:00:00.000

I would like to generate result for three years 2010, 2011, 2012 with the eligibility plan number (for all 12 different months as different column),

If member is eligible on 1^st of the month he is eligible for that related plan on that particular month.

You can see member 1234 was eligible till August – 2011 with plan id 20. (data line – 3)

But, next time member got eligibility on July – 2012 with different plan id.

So, member was not eligible between time frame Sep – 2011 to June – 2012. That’s why in result I would like to see blank as plan id.

Expected Result:
memberid                          Year       Jan         Feb        March   April      May       June      July        Aug        Sep        Oct         Nov        Dec
1234                             2010       20           20           20           20           20           20        20           20           20           20           20           20
1234                             2011       20           20           20           20           20           20        20           20
1234                             2012                                                                                               1              1              1              1              1              1

This is what I got so far..

But this CTE is taking so long time for multiple member ids. ( I do have more than 10,000 members in my original query)

CREATE TABLE #temp_Data
  (
     memberid   VARCHAR(20),
     planid     INT,
     DATE_BEGIN DATETIME NOT NULL,
     DATE_END   DATETIME NOT NULL
  )

INSERT INTO #temp_Data
SELECT '1234',20,'2009-10-01 00:00:00.000','2010-03-31 00:00:00.000'
UNION
SELECT '1234',20,'2010-04-01 00:00:00.000','2011-05-31 00:00:00.000'
UNION
SELECT '1234',20,'2011-06-01 00:00:00.000','2011-08-31 00:00:00.000'
UNION
SELECT '1234',1,'2012-07-01 00:00:00.000','2029-12-31 00:00:00.000'


CREATE TABLE #Dates
  (
     memberid   VARCHAR(20),
     planid     INT,
     DATE_BEGIN DATETIME NOT NULL,
     DATE_END   DATETIME NOT NULL
  )

INSERT INTO #Dates
SELECT memberid,
         planid,
         MIN(DATE_BEGIN),  -- I KNOW I AM DOING THIS WRONG WAY
         MAX(DATE_END)  -- FOR BOTH DATES
FROM #temp_Data
GROUP BY memberid,
            planid

SELECT * FROM #Dates ORDER BY DATE_BEGIN

CREATE TABLE #Months
  (
     memberid VARCHAR(20),
     [Year]   INT,
     [Month]  INT,
     planid   INT,
     startdate DATETIME,
     endate   DATETIME
  )
  
;WITH MONTHS (memberid, planid, [Year], [Month], [Date], [End])
     AS (SELECT memberid,
                planid,
                Datepart(YY, DATE_BEGIN)                                      AS [Year],
                Datepart(m, DATE_BEGIN)                                       AS [Month],
                DATE_BEGIN                                                    AS [Date],
                Dateadd(s, -1, Dateadd(m, Datediff(m, 0, DATE_BEGIN) + 1, 0)) AS [End]
         FROM   #Dates
         UNION ALL
         SELECT D.memberid,
                D.planid,
                Datepart(YY, Dateadd(m, 1, [Date])),
                Datepart(m, Dateadd(m, 1, [Date])),
                Dateadd(m, 1, [Date]),
                Dateadd(s, -1, Dateadd(m, Datediff(m, 0, Dateadd(m, 1, [Date])) + 1, 0)) AS [End]
         FROM   #Dates D
                INNER JOIN MONTHS M
                        ON D.memberid = M.memberid
                           AND D.planid = M.planid
         WHERE  Cast(Datepart(yy, [Date]) AS VARCHAR(4))+ RIGHT('0' + Cast(Datepart(mm, [Date]) AS VARCHAR(2)), 2) < Cast(Datepart(yy, DATE_END) AS VARCHAR(4))+ RIGHT('0' + Cast(Datepart(mm, DATE_END) AS VARCHAR(2)), 2))



INSERT INTO #Months
SELECT memberid,
       [Year],
       [Month],
       planid,
       [date],
       [end]
FROM   MONTHS                                                                        
WHERE  [END] < '1/1/13'
       AND [Date] >= '1/1/10'
OPTION (MAXRECURSION 0)  
SELECT * FROM #Months       
ORDER BY Year,Month

DROP TABLE #temp_Data,#Dates,#Months

ANK HIT - if reply helps, please mark it as ANSWER or helpful post