Sql Server 学习2

很多东西只有自己动手去做了才能理解　　其中的含义   呵呵  先把练手的代码贴出来以后有空了再做分析吧

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
BEGIN
    declare @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.cno
 not 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 dd
    where cc.bno=dd.bno
    and dd.bname='计算机方法'
    and  not exists(
    SELECT * FROM BORROW aa,t_Books bb
        WHERE aa.BNO=bb.BNO
            AND 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 t
 where 
  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 cno

 select * 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
 )
 as
 begin
    begin transaction
    declare @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)
    begin
        commit transaction
        print '借书成功'
    end
    else
    begin
        rollback transaction
        print '无库存'
    end
 end
 

 select 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 int
 declare @bname varchar(30)
 declare @author varchar(30)
 declare @price numeric(10,2)
 declare @quantity int 

 declare myCursor cursor for select * from t_Books

 open myCursor

 fetch next from myCursor into @bno,@bname,@author,@price,@quantity

 while(@@FETCH_STATUS=0)
 begin
    if(@bno=2)
    begin
        update t_Books set price=@price+100 where current of myCursor
    end
    fetch next from myCursor into @bno,@bname,@author,@price,@quantity
 end
 close myCursor

 deallocate myCursor

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