with list_numbers as
(
　　select Name, AuthorOrTime, Url, Price, EstimatePrice, Size, Category,
　　ROW_NUMBER() over (order by Name, AuthorOrTime, Url, Price, EstimatePrice, Size, Category) as 'rownumber'
　　from Arts
)
delete list_numbers where rownumber not in
(
　　select min(rownumber) from list_numbers group by Name, AuthorOrTime, Url, Price, EstimatePrice, Size, Category
)