1.创建表

CREAT TABLE tabel_name

{

    字段名称 数据类型  可选择的约束条件，

   column dataType contrai,

   --主键说明可以放在字段中单独说明 也可以放在最后统一说明

   PRIMARY KEY(one or more columns)

};

提示 auto_incremert 表示自动增长

--查看当前数据库中所有表

show tables;

int unsigned 无符号整型

auto_increment 表示自动增长

not null 表示不能为空

primary key 表示主键

default 默认值

实例：

1.创建班级表：

mysql> create table classed(
    -> id int unsigned primary key auto_increment,
    -> name varchar(10) not null,
    -> num int(4)
    -> );
Query OK, 0 rows affected (0.00 sec)

2.创建学生表：

mysql> create table students(
    -> id int unsigned primary key auto_increment,
    -> name varchar(20) not null,
    -> age tinyint(1),
    -> high decimal(3,2),
    -> gender enum("man","woman"),
    -> cls_id int unsigned
    -> );
Query OK, 0 rows affected (0.00 sec)

3.查看表结构：

mysql> desc students;
+--------+---------------------+------+-----+---------+----------------+
| Field  | Type                | Null | Key | Default | Extra          |
+--------+---------------------+------+-----+---------+----------------+
| id     | int(10) unsigned    | NO   | PRI | NULL    | auto_increment |
| name   | varchar(20)         | NO   |     | NULL    |                |
| age    | tinyint(1)          | YES  |     | NULL    |                |
| high   | decimal(3,2)        | YES  |     | NULL    |                |
| gender | enum('man','woman') | YES  |     | NULL    |                |
| cls_id | int(10) unsigned    | YES  |     | NULL    |                |
+--------+---------------------+------+-----+---------+----------------+
6 rows in set (0.00 sec)

4.查看创建的所有表：

mysql> show tables;
+-----------------------+
| Tables_in_school_data |
+-----------------------+
| classed               |
| classes               |
| students              |
+-----------------------+
3 rows in set (0.00 sec)