mysql 建表、查表、查表结构

进入数据库：

 mysql> use sunshine_blog;
输出：
 Database changed

查数据库表：

 mysql> show tables;
输出：
 +-------------------------+
 | Tables_in_sunshine_blog |
 +-------------------------+
 | test                    |
 | user                    |
 +-------------------------+
 2 rows in set (0.00 sec)

建表：auto_increment自动递增；not null 非空；primary key(字段) 主键；

 mysql> create table test(
 -> name varchar(15),
 -> email varchar(25),
 -> phone_number int,
 -> id int not null auto_increment,
 -> primary key(id));
输出：
 Query OK, 0 rows affected (0.16 sec)

显示字段、字段信息命令：

 mysql> show columns from test;
输出：
 +--------------+-------------+------+-----+---------+----------------+
 | Field        | Type        | Null | Key | Default | Extra          |
 +--------------+-------------+------+-----+---------+----------------+
 | name         | varchar(15) | YES  |     | NULL    |                |
 | email        | varchar(25) | YES  |     | NULL    |                |
 | phone_number | int(11)     | YES  |     | NULL    |                |
 | id           | int(11)     | NO   | PRI | NULL    | auto_increment |
 +--------------+-------------+------+-----+---------+----------------+
 4 rows in set (0.01 sec)

与该作用相同的语句：

 mysql> describe test;
输出：
 +--------------+-------------+------+-----+---------+----------------+
 | Field        | Type        | Null | Key | Default | Extra          |
 +--------------+-------------+------+-----+---------+----------------+
 | name         | varchar(15) | YES  |     | NULL    |                |
 | email        | varchar(25) | YES  |     | NULL    |                |
 | phone_number | int(11)     | YES  |     | NULL    |                |
 | id           | int(11)     | NO   | PRI | NULL    | auto_increment |
 +--------------+-------------+------+-----+---------+----------------+
 4 rows in set (0.01 sec)