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)