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select *,

row_number() over(partition by user_no order by amount desc) r1,

rank() over(partition by user_no order by amount desc) r2,

dense_rank() over(partition by user_no order by amount desc) r3

from order_tab;

select *,row_number() over(partition by user_no order by amount desc) r

from order_tab

where r<=3;-- 报错：先执行where再执行select子句

select *

from (select *,row_number() over(partition by user_no order by amount desc) r

from order_tab) t

where r<=3;