以前记录的太少,现在开始吧:
1. [root@server3 ~]# mysql -h server3 -u hive –p
ERROR 1045 (28000): Access deniedfor user 'hive'@'server3' (using password: NO) mysql无法通过该命令登陆
解决办法:在本地C:\Windows\System32\drivers\etc找到hosts文件,将对应主机和ip地址输入,但发现上面还是无法登陆,但NO变为YES,出现提示密码输入位置,
这个时候问题就在于密码不对了,检查下用户密码对不对吧,而这个hosts文件相当于记录了域名和ip的对应关系,可以用谷歌的域名访问百度的ip,实际网页和ip对应。
2. ERROR 1093 (HY000): You can't specify target table 'Student' for update in FROM clause
命令为删除重复数据
delete from Student where Sno not in (select Sno from Student group by Sname order by Sno);
原因就是字面意思不能在from语句中直接指定表进行更新操作
解决方法,将原表导入到一个临时表
delete from Student where Sno not in (select Sno from (select *from Student)b group by Sname);
就是把Student 改成同样的select *from Student,但一定要加个别名,不然会出现下面的错误
ERROR 1248 (42000): Every derived table must have its own alias
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