MySQL创建用户并设置访问控制权限
MySQL创建用户并设置访问控制权限语法：GRANT ALL PRIVILEGES ON *.* TO
MySQL创建用户并设置访问控制权限语法：
GRANT ALL PRIVILEGES ON *.* TO 'username'@'%' IDENTIFIED BY 'password' WITH GRANT OPTION;
说明：
1、"*.*"是设置此用户对数据库和表的控制。例如设置此用户可以控制mysql库的user表，，那么就应该写成"mysql.user"。
2、"%"是设置此用户允许访问的主机。
3、"username"访问数据库的用户。
4、"password"访问数据库的密码。
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