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select * from stu
select id,row_number() over (partition by snm order by id) from stu
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id snm
----------------
111 111V
111 111W
222 222N
333 3123
444 3123
555 3123
666 3232
777 3232
--·Ö×éºóµÄ½á¹û
id
------------
111 1
111 1
222 1
333 1
444 2
555 3
666 1
777 2
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