----方法1：
WITH UserInfos AS
(
select *,row_number() over(order by user_id) as RowNumber
from user_info
)
select *
from UserInfos
where RowNumber between 21 and 30
----方法2：
select * from
(
select *,row_number() over(order by user_id desc) as RowNumber
from user_info
) A
where RowNumber between 21 and 30