利用游标删除重复字段的记录

declare @max integer,@id integer
declare cur_rows cursor local for select id,count(*) from 表名 group by id having count(*) > 1
open cur_rows
fetch cur_rows into @id,@max
while @@fetch_status=0
begin
    select @max = @max -1
    set rowcount @max
    delete from 表名 where id = @id
    fetch cur_rows into @id,@max
end
close cur_rows
set rowcount 0