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关于mysql delete的问题,需要的朋友可以参考下。
由于mysql数据库的相关内部问题
导致delete from table where col not in (select col from table group by xx)
会提示报错
我们要做的是
create table tmp selete col from table group by xx;
delete from table where col not in (select col from tmp);
drop table tmp;
今天，在开发自己的项目中需要把项目原来的数据导入到新的系统中，在这个过程中会产生部分脏数据。
我们需要把这部分脏数据删除到，在删除的过程中我写的delete sql语句不能执行不知道为什么，可以同样的语句执行
select 是没有问题的
如：
delete from student a where a.id in (1,2);()
select a.* from student a where a.id in (1,2);()
这是什么原因了呢？
结果处理：
delete 在写操作一张表的时候 不用别名操作成功！
如：
delete from student where id in (1,2);()
我使用mysql版本：5.1.30-community-log
这是在开发中遇到的一个小问题，积累起来。
