create table `test` (
`id` double ,
`aid` double ,
`bid` double
);
insert into `test` (`id`, `aid`, `bid`) values('187','102','90');
insert into `test` (`id`, `aid`, `bid`) values('188','102','96');
insert into `test` (`id`, `aid`, `bid`) values('189','102','109');
insert into `test` (`id`, `aid`, `bid`) values('289','101','59');
insert into `test` (`id`, `aid`, `bid`) values('290','101','62');
insert into `test` (`id`, `aid`, `bid`) values('291','101','66');
insert into `test` (`id`, `aid`, `bid`) values('292','101','68');
insert into `test` (`id`, `aid`, `bid`) values('293','101','69');
insert into `test` (`id`, `aid`, `bid`) values('294','101','70');
insert into `test` (`id`, `aid`, `bid`) values('295','101','71');
insert into `test` (`id`, `aid`, `bid`) values('296','101','86');
insert into `test` (`id`, `aid`, `bid`) values('297','101','87');
insert into `test` (`id`, `aid`, `bid`) values('298','101','88');
insert into `test` (`id`, `aid`, `bid`) values('299','101','89');
insert into `test` (`id`, `aid`, `bid`) values('301','101','91');
insert into `test` (`id`, `aid`, `bid`) values('302','101','92');
insert into `test` (`id`, `aid`, `bid`) values('303','101','93');
insert into `test` (`id`, `aid`, `bid`) values('304','101','94');
insert into `test` (`id`, `aid`, `bid`) values('305','101','95');
insert into `test` (`id`, `aid`, `bid`) values('306','101','96');
insert into `test` (`id`, `aid`, `bid`) values('307','101','109');要求。当aid相同的时候,把aid较大的那个的bid的值更新成跟aid较小的那个值的bid一样
参考一下这个贴子的提问方式http://topic.csdn.net/u/20091130/20/8343ee6a-417c-4c2d-9415-fa46604a00cf.html
1. 你的 create table xxx .. 语句
2. 你的 insert into xxx ... 语句
3. 结果是什么样,(并给以简单的算法描述)
4. 你用的数据库名称和版本(经常有人在MS SQL server版问 MySQL)
这样想帮你的人可以直接搭建和你相同的环境,并在给出方案前进行测试,避免文字描述理解上的误差。
“当aid相同的时候”
什么意思?aid跟什么东西相同的时候?