数据库

数据库，用的还很生，将就这看吧

create table Customer(       Cusno varchar2(20) primary key,       cusname varchar2(20) not null,       address  varchar2(20),       tel   varchar2(50) unique);create table product(       prono varchar2(20) primary key,       proname varchar2(20)  ,       price  number(10,2) ,       stocks int );create table proOut(       saledate date ,       cusno  varchar2(20) ,       prono varchar2(20) ,       quantity int,       foreign key (cusno) references Customer(cusno) ,       foreign key(prono) references  Product(prono))--插入数据insert into customer values ('C001','杨婷','北京','010-5328953');insert into customer values ('C002','李和平','上海','021-6235965');insert into customer values ('C003','叶新','成都','024-3222781');insert into customer values ('C004','冯辰诚','上海','021-8723596');insert into customer values ('C005','张展','郑州','0371-8907654');--插入值insert into product values('p0001','液晶电视',5600.00,800);insert into product values('p0002','空调',2390.00,460);insert into product values('p0003','洗衣机',5600.00,600);insert into product values('p0004','电热水器',3700.00,120);insert into proOut values (to_date('2007-10-27','yyyy-mm-dd'),'C001','p0001',3 );insert into proOut values (to_date('2007-11-06','yyyy-mm-dd'),'C004','p0003',40 );insert into proOut values (to_date('2007-12-27','yyyy-mm-dd'),'C001','p0003',5 );insert into proOut values (to_date('2008-3-15','yyyy-mm-dd'),'C002','p0002',12 );insert into proOut values (to_date('2008-05-02','yyyy-mm-dd'),'C003','p0001',9);insert into proOut values (to_date('2008-09-21','yyyy-mm-dd'),'C004','p0001',30 );insert into proOut values (to_date('2008-11-21','yyyy-mm-dd'),'C004','p0001',73 );--查询表select * from customer;select * from product;select * from proout;--3)  将产品“洗衣机”的单价加1000元。update product set price=price+1000 where proname='洗衣机';--4)  编号“P0005”的产品“电冰箱”，单价3000，库存1000，录入时遗漏，请编写SQL语句插入该记录。insert into product values ('p0005','电冰箱',3000.00,'1000')--删除这一行select * from productdelete  from product  where proname='空调';insert into product values ('p0005','电冰箱',3000.00,'1000');--5)  查询购买了产品编号“P0002”的客户编号、客户名和电话，查询结果按客户名降序排列。select c.cusno,c.cusname,c.tel from   proout p inner join customer  c on c.cusno = p.cusno where p.prono='p0002' ;--6)  查询所有的客户编号和客户名以及它们所购买的产品编号和产品名。（包括没买产品的顾客）。select c.cusno,c.cusname,p.prono,p.proname from customer c left join proout pr on  c.cusno=pr.cusno  left join product pon p.prono= pr.prono--7)  查询客户表中“姓张”的客户的姓名，地址，电话。select c.cusname,c.address,c.tel from customer  c where  c.cusname like '张%'; --8)  查询产品表中产品名称中带有“电”字的产品编号、产品名称、单价。select p.prono,p.proname,p.price from product p where p.proname like '%电%';--9)  查询产品表中库存数量大于产品表中库存量的平均值的产品编号、产品名称、库存量  select * from product  p where p.stocks>(select avg(p.stocks) from product p);--10) 查询2008年液晶电视的销售总数量和销售总额（总额=销售总数量*单价）select sum(p.quantity),sum(p.quantity*pr.price) from  proout p inner join product pr on p.prono=pr.prono  where to_char(p.saledate,'yyyy')=2008 and pr.proname='液晶电视';--11) 查询出2008年销售给上海客户的客户名，商品名称，销售数量。select distinct  c.cusname,pr. proname,p.quantity from customer c inner join proout p on p.cusno=p.cusno  inner join product pr on  pr.prono=p.prono       where to_char(p.saledate,'yyyy')=2008 and c.address='上海';--12) 更新液晶电视的价格为8800元，库存数量为888。update  product set price ='8800',stocks=888 where proname='液晶电视'; --13) 查询电话号码以021开头且最后一位不是5的客户姓名、客户电话、客户地址。select  * from customer c where c.tel like '021%'and c.tel not like '%5';--14) 查询在2007年内购订购过产品的客户编号，客户名以及产品名和单价。select c.cusno,c.cusname,pr.proname,pr.price from customer c inner join proout p on c.cusno=p.cusno inner join product pr on pr.prono=p.prono where to_char(p.saledate,'yyyy')=2007;--15) 查询定购过产品的客户编号、客户名和电话。查询结果按客户编号升序排列。select c.cusno,c.cusname,c.tel from customer c order by c.cusno asc;--16) 统计销售数量超过100的产品名。select pr.proname from proout p left join product  pr on p.prono=pr.prono  where p.quantity>100--17) 删除销售表中销售数量低于6的销售记录 。delete from proout p where p.quantity<6 --18) 更改地址为北京的用户姓名为杨婷婷。update  customer set cusname='杨婷婷' where  address ='北京'

这里面几乎涵盖了目前所学的全部，用来练手真的不错