2.创建一个商店的数据，记录客户及购物情况，有以下三个表组成

1.商品goods(商品编号goods_id，商品goods_name, 单价unitprice, 商品类别category, 供应商provider)

2.客户customer(客户号customer_id,姓名name,住址address,邮箱email,性别sex，身份证card_id)

3.购买purchase(购买订单号order_id,客户号customer_id,商品号goods_id,购买数量nums)

create table goods(
    goods_id int,
    goods_name varchar(50),
    unit_price decimal(7,2),
    category varchar(50),
    provider varchar(50)
);

create table customer(
    customer_id int,
    name varchar(20),
    address varchar(20),
    sex varchar(5),
    card_id varchar(18)
);


create table purches(
    order_id int,
    customer_id int,
    goods_id int,
    nums int
);

创建出来的表为