create table T([time] varchar(10))
insert T select '9:05'
union all select '9:10'
union all select '9:11'
union all select '9:15'
go
select
begTime=A.[time],
endTime=min(B.[time]),
间隔=datediff(minute, convert(datetime, A.[time], 108), convert(datetime, min(B.[time]), 108))
from T as A, T as B
where convert(datetime, A.[time], 108)<convert(datetime, B.[time], 108)
group by A.[time]