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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
本文来自ChinaUnix博客,如果查看原文请点:http://blog.chinaunix.net/u/29134/showart_1904273.html |
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