Esto funciona para tu ejemplo, avísame si no funciona para otros datos
create table #Range
(
[Start] INT,
[End] INT
)
insert into #Range ([Start], [End]) Values (1, 8)
insert into #Range ([Start], [End]) Values (9, 13)
insert into #Range ([Start], [End]) Values (14, 20)
insert into #Range ([Start], [End]) Values (20, 25)
insert into #Range ([Start], [End]) Values (30, 42)
insert into #Range ([Start], [End]) Values (42, 49)
insert into #Range ([Start], [End]) Values (60, 67)
;with RangeTable as
(select
t1.[Start],
t1.[End],
row_number() over (order by t1.[Start]) as [Index]
from
#Range t1
where t1.Start not in (select
[End]
from
#Range
Union
select
[End] + 1
from
#Range
)
)
select
t1.[Start],
case
when t2.[Start] is null then
(select max([End])
from #Range)
else
(select max([End])
from #Range
where t2.[Start] > [End])
end as [End]
from
RangeTable t1
left join
RangeTable t2
on
t1.[Index] = t2.[Index]-1
drop table #Range;
