1.打开SQL Plus，以system用户登录BOOKSALE数据库。
system/tiger @booksale
2.按下列方式创建一个用户bs，并给该用户授权。
create user bs identified by bs default tablespace users;
grant resource,connect,create view to bs;
3.使用bs用户登录数据库，并进行下面的相关操作。
4.根据图书销售系统关系模式设计，创建表1至表6。
①customers表：
create table customers(
customer_id number(4) primary key,
name char(20) not null,
phone varchar2(50) not null,
email varchar2(50),
address varchar2(200),
code varchar2(10)
);
②publishers表：
create table publishers(
publisher_id number(2) primary key,
name varchar2(50),
contact char(10),
phone varchar2(50)
);
③books表：
create table books(
ISBN varchar2(50) primary key,
title varchar2(50),
author varchar2(50),
pubdate date,
publisher_id number(2),
cost number(6,2),
retail number(6,2),
category varchar2(50),
foreign key(publisher_id) references publishers(publisher_id)
);
④orders表：
create table orders(
order_id number(4) primary key,
customer_id number(4),
orderdate date not null,
shipdate date,
shipaddress varchar2(200),
shipcode varchar2(10),
foreign key(customer_id) references customers(customer_id)
);
⑤orderitem表：
create table orderitem(
order_id number(4),
item_id number(4),
ISBN varchar2(50) not null,
quantity number(4),
primary key(order_id,item_id),
foreign key(order_id) references orders(order_id)
);
⑥promotion表：
create table promotion(
gift_id number(2),
name char(20) primary key,
minretail number(5,2),
maxretail number(5,2)
);
5.在CUSTOMERS表的name列上创建一个B-树索引，要求索引值为大写字母。
create index cus_name_index on customers(upper(name)) tablespace users;
6.在BOOKS表的title列上创建一个非唯一性索引。
create index book_title_index on books(title) tablespace users;
7.在ORDERitem表的ISBN列上创建一个唯一性索引。
create unique index oitem_isbn_index on orderitem(ISBN) tablespace users;
8.创建一个视图customers_book，描述客户与订单的详细信息，包括客户编号、客户名单、订购图书的ISBN、图书名称、图书数量、订货日期、发货日期等。
create view customers_book(customer_id,name,ISBN,title,quantity,orderdate,shipdate)
as
select c.customer_id,c.name,o.ISBN,b.title,o.quantity,O.orderdate,O.shipdate
from customers c,orderitem o,orders O,books b;
9.创建一个视图customers_gift，描述客户获得礼品的信息，包括客户名称、图书总价、礼品名称。
create view customers_gift(customer_name,book_price,promotion_name)
as
select c.name,(case when oi.quantity<=10 then oi.quantity*b.retail else oi.quantity*b.cost end),p.name
from customers c,orderitem oi,books b,promotion p,orders o
where c.customer_id=o.customer_id and o.order_id=oi.order_id and b.ISBN=oi.ISBN and
case when oi.quantity<=10 then oi.quantity*b.retail else oi.quantity*b.cost end between minretail and maxretail;
10.定义序列seq_customers，产生客户编号，序列起始值为1，步长为1，不缓存，不循环。
create sequence seq_customers start with 1 increment by 1 nocache nocycle;
11.定义序列seq_orders，产生订单编号，序列起始值为1000，步长为1，不缓存，不循环。
create sequence seq_orders start with 1000 increment by 1 nocache nocycle;
12.定义序列seq_promotion，产生礼品编号，序列起始值为1，步长为1，不缓存，不循环。
create sequence seq_promotion start with 1 increment by 1 nocache nocycle;