创建数据库指令create database [数据库名];
选中某个数据库操作指令use [数据库名]；会出现Database changed
查看某个数据库中所有的数据表show tables;出现Empty set则说明数据库中一个数据表也没有
创建数据表指令：
CREATE TABLE pet(
name VARCHAR(20),
owner VARCHAR(20),
species VARCHAR(20),
sex CHAR(1),
birth DATE,
death DATE);
describe pet;可以查看pet数据表中的结构
例：
show tables;
+----------------+
| Tables_in_test |
+----------------+
| pet |
+----------------+
1 row in set (0.05 sec)
mysql> describe pet;
+---------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+---------+-------------+------+-----+---------+-------+
| name | varchar(20) | YES | | NULL | |
| owner | varchar(20) | YES | | NULL | |
| species | varchar(20) | YES | | NULL | |
| sex | char(1) | YES | | NULL | |
| birth | date | YES | | NULL | |
| death | date | YES | | NULL | |
+---------+-------------+------+-----+---------+-------+