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SELECT TOP Ò³¼Ç¼ÊýÁ¿ *
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  (SELECT TOP (ÿҳÐÐÊý*(Ò³Êý-1)) ID
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(
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  na varchar(20)
)
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insert into stut values(1,'aa')
insert into stut values(2,'bb')
insert into stut values(3,'df')
insert into stut values(4,'Öйú')
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