在MySQL中来平移对应的行

以前写的，笨办法，不知道大家有什么好的办法没有？

表结构：
/*DDL Information For - t_girl.yld1*/
-------------------------------------

Table Create Table
------ ---------------------------------------------------------
yld1 CREATE TABLE `yld1` (
`id` int(11) default NULL,
`uid` int(11) default NULL
) ENGINE=MyISAM DEFAULT CHARSET=utf8 ROW_FORMAT=DYNAMIC

初始数据：

query result(4 records)

id	uid
(NULL)	6
(NULL)	5
2	(NULL)
1	(NULL)

执行过程：
create table yld2 select * from yld1

delete from yld1 where id is null;
delete from yld2 where id is not null;
alter table yld1 add autoid int not null AUTO_INCREMENT primary key;
alter table yld2 add autoid int not null AUTO_INCREMENT primary key;

update yld1 as a,yld2 as b set a.uid = b.uid where a.autoid = b.autoid;

alter table yld1 drop autoid;

drop table yld2;

最终结果：

query result(2 records)

id	uid
2	6
1	5

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