目录

一：创建数据库

二：创建表

2.1：创建employees表

2.2：创建orders表

2.3：创建invoices表

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一：创建数据库

mysql> create database mydb6_product;
Query OK, 1 row affected (0.01 sec)

mysql> show databases;

mysql> use mydb6_product;
Database changed
mysql> select database();

二：创建表

2.1：创建employees表

mysql> create table employees(id int primary key,
    -> name varchar(50) not null,
    -> age int,
    -> gender varchar(10)  not null default 'unknown',
    -> salary float);

2.2：创建orders表

mysql> create table orders(id int primary key,
    -> name varchar(100) not null,
    -> price float,
    -> quantity int,
    -> category varchar(50));
Query OK, 0 rows affected (0.02 sec)

2.3：创建invoices表

mysql>  create table invoices (number int primary key,
    -> order_id int ,
    -> in_date date,
    -> total_amount float,
    -> foreign key (order_id) references orders(id) );

mysql> alter table invoices modify number int auto_increment;
Query OK, 0 rows affected (0.07 sec)
Records: 0  Duplicates: 0  Warnings: 0