Oracle中的row_number()用法

--每个班的前3名 根据grade分组，(partitionby)



select *

from (select username,grade,

math + chemistry as total,

dense_rank() over(partition by grade order by math + chemistry desc) as m

from user_info) t

where m <= 3;

---数学前3名

select *

from (select username,

age,

math,

row_number() over(order by math desc) as m

from user_info) t

where t.m <= 3;

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dense_rank()over(order by '')并列第一

row_number()over 会去除重复行

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