show databases;

use 数据库名;

show tables;

describe 表名;

SELECT * FROM 表名

 create databse 库名;

create table 表名 (字段设定列表)；mysql> create table name(-> id int auto_increment not null primary key ,-> uname char(8),-> gender char(2),-> birthday date );
Query OK, 0 rows affected (0.03 sec)mysql> show tables;
+------------------+
| Tables_in_userdb |
+------------------+
| name             |
+------------------+
1 row in set (0.00 sec)mysql> describe name;
+----------+---------+------+-----+---------+----------------+
| Field    | Type    | Null | Key | Default | Extra          |
+----------+---------+------+-----+---------+----------------+
| id       | int(11) | NO   | PRI | NULL    | auto_increment |
| uname    | char(8) | YES  |     | NULL    |                |
| gender   | char(2) | YES  |     | NULL    |                |
| birthday | date    | YES  |     | NULL    |                |
+----------+---------+------+-----+---------+----------------+
4 rows in set (0.00 sec)注： auto_increment 自增primary key    主键

 insert into name(uname,gender,birthday) values('张三','男','1971-10-01');

update name set birthday='1971-01-10' where uname='张三';

delete from name where uname='张三';

drop table 表名

 drop database 库名;

mysqldump -u root -p --opt 数据库名>备份名; //进入到库目录

mysql -u root -p 数据库名<备份名; //恢复时数据库必须存在，可以为空数据库

 mysql> grant select,insert,update,delete on *.* to user001@"%" Identified by "123456";

  mysql>grant select,insert,update,delete on test.* to user002@localhost identified by "123456";