新手的第一次mysql

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,	amout float(6,2),	date date not null};create table books{	isbn char(13) not null primary key,	author char(50),	title char(50),	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};