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Convert list of dates in a date range in SQL Server

For ex:

enter image description here

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  • How do you obtain those intervals? I see 7 records on the left and only 6 values on the right.
    – Alexei
    Commented Feb 15, 2018 at 9:39

1 Answer 1

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It's classic "islands" problem.

Here is "classic" solution:

declare @t table (dt date);

insert into @t(dt) values 
  ('20180202'), 
  ('20180203'), 
  ('20180204'), 
  ('20180205'), 
  ('20180209'), 
  ('20180212'), 
  ('20180213');

with c as 
( 
  select dt, dateadd(day, -1 * dense_rank() over(order by dt), dt) as grp 
  from @t 
) 
select min(dt) as start_range, max(dt) as end_range 
from c 
group by grp;
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