MySQL 创建数据表

Posted 2022-04-16 satu

MySQL 创建数据库

 

1、选择要操作的数据库

命令：USE dbname

mysql> USE java407
Database changed

 

2、查看要操作的数据库中的所有数据表

命令：SHOW TABLES;

mysql> SHOW TABLES;
Empty set (0.00 sec)

 

3、创建数据表

命令：

mysql> CREATE TABLE users (
    -> id INT(10) NOT NULL AUTO_INCREMENT,
    -> username VARCHAR(16) NOT NULL,
    -> password VARCHAR(16) NOT NULL,
    -> sex CHAR(2) NOT NULL,
    -> age INT(3) NULL,
    -> birth DATE NULL,
    -> PRIMARY KEY(id));
Query OK, 0 rows affected (0.69 sec)

 

4、查看要操作的数据库中的所有数据表

命令：SHOW TABLES;

mysql> SHOW TABLES;
+-------------------+
| Tables_in_java407 |
+-------------------+
| users             |
+-------------------+
1 row in set (0.00 sec)

 

5、查看数据表定义

mysql> DESC users;
+----------+-------------+------+-----+---------+----------------+
| Field    | Type        | Null | Key | Default | Extra          |
+----------+-------------+------+-----+---------+----------------+
| id       | int(10)     | NO   | PRI | NULL    | auto_increment |
| username | varchar(16) | NO   |     | NULL    |                |
| password | varchar(16) | NO   |     | NULL    |                |
| sex      | char(2)     | NO   |     | NULL    |                |
| age      | int(3)      | YES  |     | NULL    |                |
| birth    | date        | YES  |     | NULL    |                |
+----------+-------------+------+-----+---------+----------------+
6 rows in set (0.00 sec)