Simulate a thru_date for point-in-time queries

With ROWNUM, you can simulate a thru_date, which can then be used for ranking reports or point-in-time queries. For example, here is the table data I have to work with:

        676230                  ENR                             8/1/2000 
        676230                  CAN                             1/12/2001 
        676230                  ENR                             2/1/2001 
        676230                  CAN                             2/13/2001 
        676230                  ENR                             3/1/2001 
        676230                  CAN                             3/13/2001 

And this is what I needed:

        676230                  ENR                             8/1/2000                        1/11/2001 
        676230                  CAN                             1/12/2001                       1/31/2001 
        676230                  ENR                             2/1/2001                        2/12/2001 
        676230                  CAN                             2/13/2001                       2/28/2001 
        676230                  ENR                             3/1/2001                        3/12/2001 
        676230                  CAN                             3/13/2001                       1/1/3000 


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is how you do it: NOTE: The current status is denoted by a 'NULL-DATE' value of 3000/01/01 in the through_date column.

SELECT from_date.participant_id,from_date.participant_status_cd, 
NVL(thru_date.effective_date_time-1,TO_DATE('01013000','mmddyyyy')) thru_date 
--       [ we want to make the thru date one day before the next from date ] 
(SELECT ROWNUM nbr, ps1.effective_date_time, ps1.participant_status_cd, ps1.participant_id 
WHERE ps1.participant_id = 676230 
) from_date, 
(SELECT ROWNUM nbr, ps2.effective_date_time, ps2.participant_status_cd, ps2.participant_id 
WHERE ps2.participant_id = 676230 
) thru_date 
WHERE from_date.nbr+1 = thru_date.nbr(+) 
--       [ we want to pull the from date from the following row for the participant ] 
AND from_date.participant_id = thru_date.participant_id(+) 

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This was first published in January 2002

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