简单的SQL Server语句转换为Mysql。

create table users
(
userid bigint primary key AUTO_INCREMENT,
username varchar(30) not null unique,
truename varchar(30) not null,
passwd varchar(30) not null,
email varchar (40) not null,
phone varchar(20) not null,
address varchar(30) not null,
postcode char(6) not null,
grade int default 1

);

create table goods
(
goodsId SMALLINT UNSIGNED primary key AUTO_INCREMENT,
goodsName varchar(40) not null,
goodsIntro varchar(500) not null,
goodsPrice float not null,
goodsNum int not null,
publisher varchar(40) not null,
photo varchar(40) not null,
type varchar(10)
);

create table orders(

ordersId bigint auto_increment primary key , -- 订单号
userId   bigint references users(userid), -- 哪个用户订的
orderDate datetime , -- 下订单的时间
orderDate timestamp NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
//设置默认时间值
//如果是在navicat下操作的话，设置字段的类型为timestamp，默认值写上CURRENT_TIMESTAMP
payMode varchar(20) default '货到付款', -- 付款的方式
isPayed bit , -- (0,表示还没有付款 1:表示已经付款了)
totalPrice float not null -- 总价格
);

CREATE TABLE orderDetail(
orderIid BIGINT,
FOREIGN KEY (orderIid) REFERENCES orders (ordersId) ,
goodsId SMALLINT UNSIGNED,//unsigned也一定要写上
FOREIGN KEY (goodsId) REFERENCES goods (goodsid),
num int not null
);