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split a record by date span

split a record by date span

(OP)
can someone help me to split ONE  record  into multiple lines with the same batch_id if the service start date and service end date are more than 30 days apart.

For e.g  the current data is in the format below
batch_id     service start date    service end date
99999            2/15/2008            4/25/2008
        
Need to be transformed to     
        
batch_id    service start date    service end date
99999             2/15/2008            3/16/2008
99999             3/16/2008            4/15/2008
99999             4/15/2008            4/25/2008


i need a SQL solution.

any help is appreciated.

RE: split a record by date span

You could use calendar view :

CODE

select  bat.batch_id
    ,   cal.calendar_date   as start_date
    ,   case when cal.calendar_date + 30 >= bat.end_date
                then bat.end_date
            else cal.calendar_date + 30
        end as end_date
from    batch   as bat
    inner join
        sys_calendar.calendar   as cal
        on  (cal.calendar_date - bat.start_date + 1) mod 30 = 0
        and cal.calendar_date between bat.start_date and bat.end_date
;

RE: split a record by date span

(OP)
Thanks al1024!

my solution was very very close to what you suggested.



 

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