create table test
(
[min] int,
[max] int
)
insert into test select 1, 5
insert into test select 6, 10
insert into test select 11, 15
insert into test select 20, 30
insert into test select 40, 50
insert into test select 51, 60
--語句
select [min],[max] = (select min([max]) from test t1
where [max]>t2.[min] and not exists(select 1 from test where [min] = t1.[max]+1)
)
from test t2
where not exists(select 1 from test where [max] = t2.[min]-1)
--結果
1 15
20 30
40 60