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增加root密码

mysqladmin -uroot -password 12345

修改root密码

mysqladmin -uroot -p12345 password 67890

创建用户

grant [priv1], [priv2],... [privN] on [database].[table] to [username]@[address] identified by [password]
GRANT ALL PRIVILEGES ON *.* TO cic@"%" IDENTIFIED BY "Hkhl2015"

刷新权限

flush privileges

连接数据库(默认选中db_test数据库)

mysql -h127.0.0.1 -uroot -p12345 db_test

显示所有数据库

show databases;

创建数据库

create database db_test CHARACTER SET utf8;

删除数据库

drop database db_test;

选择数据库

use db_test

显示所有数据表

show tables

设置字符集

set charset utf8;

添加列

alter table t_user add column name varchar(64) not null;

删除列 

alter table t_user drop column name;

修改表名

alter table t_user rename to t_new_user;

显示状态列表

show processlist;

显示创建表

show create table t_user;