本题用到下面三个关系表：
CARD     借书卡:   (CNO 卡号，NAME  姓名，CLASS 班级)
BOOKS    图书:     (BNO 书号，BNAME 书名,AUTHOR 作者，PRICE 单价，QUANTITY 库存册数 )
BORROW   借书记录: (CNO 借书卡号，BNO 书号，RDATE 还书日期--1.    写出自定义函数，要求输入借书卡号能得到该卡号所借书金额的总和CREATE FUNCTION GetSUMP
(
@CNO int
)
RETURNS int
AS
BEGINdeclare @sum int
select @sum=sum(price) from BOOKS where bno in (select bno from BORROW where cno=@CNO)return @sum
END
GO
-- 2． 找出借书超过5本的读者,输出借书卡号及所借图书册数。
select cno,COUNT(bno) t from borrow group by cno having count(bno)>=2
-- 6． 查询现有图书中价格最高的图书，输出书名及作者。select author,t_Books.bname from t_Books where price in  (select  max(price) from t_Books)--  7． 查询当前借了"计算方法"但没有借"计算方法习题集"的读者，输出其借书卡号，并按卡号降序排序输出。
select * from borrow bb where bno= (select bno bt from t_Books where bname='计算机方法')and bb.cnonot in
(select cno c from borrow where bno=(select bno b from t_Books where bname='计算机方法习题集') ) order by cno desc;select cc.cno from borrow cc,t_Books ddwhere cc.bno=dd.bnoand dd.bname='计算机方法'and  not exists(SELECT * FROM BORROW aa,t_Books bbWHERE aa.BNO=bb.BNOAND bb.BNAME='计算机方法习题集'and cc.cno=aa.cno)--将"C01"班同学所借图书的还期都延长一周。update  borrow set  borrow.rdate=dateadd(day,7,rdate) where cno in (select bno from borrow where cno=1)--  9． 从BOOKS表中删除当前无人借阅的图书记录。
delete t from t_books twhere not exists( select * from borrow where t.bno=bno)--  10．如果经常按书名查询图书信息，请建立合适的索引。create clustered index IBname on t_Books(bname)--  11．在BORROW表上建立一个触发器，完成如下功能：如果读者借阅的书名是"数据库技术及应用"，--就将该读者的借阅记录保存在BORROW_SAVE表中（注ORROW_SAVE表结构同BORROW表）。
alter trigger trg_insert on borrow
for insert,update
as
IF @@ROWCOUNT>0
insert  borrow_save
SELECT i.*
FROM INSERTED i,t_books b
WHERE i.BNO=b.BNO and b.bname='数据库技术及应用'insert into t_Books values('数据库技术及应用','张啊红',90.00,90)insert into borrow values(6,7,GETDATE())
--吧查询出来的数据存入指定表中
insert t_Books select bname,author,price,quantity from t_Books where bname='诛仙3'
-- 12．建立一个视图，显示"01"班学生的借书信息（只要求显示姓名和书名）。
alter view v_v05
as
select cc.name,tb.bname from borrow b,t_Card cc,t_Books tb where b.cno=cc.cno and tb.bno=b.bno and b.cno in(select cno c from t_Card where class='09软工5版')----
CREATE VIEW V_VIEW
AS
select name,bname
from  t_Books,t_Card,borrow
where borrow.cno=t_Card.cno and borrow.bno=t_Books.bno and class='09软工5版'select * from v_v05
select * from V_VIEW---  13．查询当前同时借有"计算方法"和"组合数学"两本书的读者，输出其借书卡号，并按卡号升序排序输出。select cno,COUNT(bno) from borrow bb where bb.bno in(select bno bb from t_Books where bname in ('计算机方法','组合数学'))group by cno having COUNT(bno)=2 order by cno desc--select cno,count(bno)  from borrow group by cnoselect * from borrow where bno in (select bno from t_Books where bname='计算机方法') and cno in(select cno from borrow where  bno in (select bno from t_Books where bname='组合数学'))order by cno desc---  14、用事务实现如下功能：一个借书卡号借走某书号的书，则该书的库存量减少1，---当某书的库存量不够1本的时候，该卡号不能借该书alter procedure proBorrowBook(@cno int ,@bno int,@rdate date)asbeginbegin transactiondeclare @quantity int select @quantity=quantity from t_Books where bno=@bno;insert into borrow values(@cno,@bno, dateadd(day,30, @rdate));update t_Books set quantity=@quantity-1 where bno=@bno;if(@quantity>0 and @@error<=0)begincommit transactionprint '借书成功'endelsebeginrollback transactionprint '无库存'endendselect GETDATE()exec proBorrowBook 2,1,'2013-01-08 17:46:01.160'--15、用游标实现将书号为‘80’的书本的价格提高10元declare @bno intdeclare @bname varchar(30)declare @author varchar(30)declare @price numeric(10,2)declare @quantity int declare myCursor cursor for select * from t_Booksopen myCursorfetch next from myCursor into @bno,@bname,@author,@price,@quantitywhile(@@FETCH_STATUS=0)beginif(@bno=2)beginupdate t_Books set price=@price+100 where current of myCursorendfetch next from myCursor into @bno,@bname,@author,@price,@quantityendclose myCursordeallocate myCursor