数据库SQL查询怎么只显示从第n列到第m列的数据，在没有标识列的

什么意思

declare cur cursor
dynamic
for
select * from table1
go
declare @i int
declare @j int
set @i=n
set @j=m
open cur
fetch relative @i from cur
while(@i<@j)
begin
fetch next from cur
set @i=@i+1
end
close cur
deallocate cur

select * from (select top(m) * from table1) as t1
where t1.id not in
(
select top(n-1) t2.id from
(
select top(m) * from table1
)as t2
)