1.mysql> create database aa;
ERROR 1044 (42000): Access denied for user ''@'localhost' to database 'aa'
这是匿名用户的意思~~~虽然你以为你是root登录
解决办法：改真正的root登录
F:\Softwares\mysql5\mysql-5.6.24-winx64\bin>mysql --user=root -pEnter password:Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 12Server version: 5.6.24 MySQL Community Server (GPL)Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql> create database dbb;Query OK, 1 row affected (0.00 sec)
注意，mysql --user=root -p 是让你用root身份登录，所以下面出现的password是root的密码，默认为空，直接enter。
F:\Softwares\mysql5\mysql-5.6.24-winx64\bin>mysql --user=root -pEnter password: ******ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)这就表示密码错误。