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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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