创建表
CREATE TABLE customers (
customerid INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
name CHAR(50) NOT NULL,
address CHAR(100) NOT NULL,
city CHAR(30) NOT NULL
);
CREATE TABLE orders (
orderid INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
customerid INT UNSIGNED NOT NULL,
amount FLOAT(6, 2),
date DATE NOT NULL
);
CREATE TABLE books (
isbn CHAR(13) NOT NULL PRIMARY KEY,
author CHAR(50),
title CHAR(100),
price FLOAT(4, 2)
);
CREATE TABLE order_items (
orderid INT UNSIGNED NOT NULL,
isbn CHAR(13) NOT NULL,
quantity TINYINT UNSIGNED,
PRIMARY KEY(orderid, isbn)
);
CREATE TABLE book_reviews (
isbn CHAR(13) NOT NULL PRIMARY KEY,
review TEXT
);
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