mysql实现分组排序并赋予序号的存贮过程

 1 drop procedure set_rank;
 2 create procedure set_rank()
 3 begin
 4 set @i=1;
 5 set @number=(select count(1) from suppliers_performance);
 6 update suppliers_performance set score_rank=0;
 7 
 8 while @i<@number
 9 do
10 begin
11     update suppliers_performance set score_rank=@i where id in (select id from (select id from suppliers_performance where score_rank=0 order by score limit 1) b);
12     set @i=@i+1;
13 end;
14 end WHILE;
15 end;