Combine consecutive date ranges

Question

Using SQL Server 2008 R2,

I\'m trying to combine date ranges into the maximum date range given that one end date is next to the following start date.

The da

Answer 1

A modified script for combining all overlapping periods.
For example
01.01.2001-01.01.2010
05.05.2005-05.05.2015

will give one period:
01.01.2001-05.05.2015

tbl.enddate must be completed

;WITH cte
  AS(
SELECT
  a.employmentid
  ,a.startdate
  ,a.enddate
from tbl a
left join tbl c on a.employmentid=c.employmentid
    and a.startdate > c.startdate
    and a.startdate <= dateadd(day, 1, c.enddate)
WHERE c.employmentid IS NULL

UNION all

SELECT
  a.employmentid
  ,a.startdate
  ,a.enddate
from cte a
inner join tbl c on a.startdate=c.startdate
    and (c.startdate = dateadd(day, 1, a.enddate) or (c.enddate > a.enddate and c.startdate <= a.enddate))
)
select distinct employmentid,
          startdate,
          nullif(max(enddate),'31.12.2099') enddate
from cte
group by employmentid, startdate