一.实验要求
二.实验过程
1.创建数据库，并使用
mysql>CREATE DATABASE mydb6_product;
mysql> USE mydb6_product;
2.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
-> );
3.创建orders表
mysql> CREATE TABLE orders (
-> id INT PRIMARY KEY,
-> name VARCHAR(100) NOT NULL,
-> price FLOAT,
-> quantity INT,
-> category VARCHAR(50)
-> );
4.创建invoices表
CREATE TABLE invoices (
number INT PRIMARY KEY AUTO_INCREMENT,
order_id INT,
in_date DATE,
total_amount FLOAT CHECK (total_amount > 0),
FOREIGN KEY (order_id) REFERENCES orders(id)
);
5.验证实验是否成功
