【创建petstore数据库与表】

MySQL之petstore

创建petstore 数据库与表-
建立数据完整性约束---
数据插入-1-用户表-
数据插入--2--商品分类表-
数据插入----4----订单表-
数据修改与删除-1-数据修改-
数据查询
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上一章链接：[MySQL实例](https://blog.csdn.net/m0_66318554/article/details/124949034)
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话不多说，一切都在mysql代码中，直接在这里插入代码片上代码：

创建petstore 数据库与表-

-----1--------

create database petstore;

----------2---------

use petstore;

create table account (userid char(6) not null,fullname varchar(10) not null,password varchar(20) not null,sex char(2) not null,address varchar(40) null,email varchar(20) null,phone varchar(11) not null,primary key (userid)
);

create table category(catid char(10) not null,catname varchar(20) null,primary key (catid)
);

create table product(productid char(10) not null,catid char(10) not null,name varchar(30) null,descn text null,listprice decimal(10,2) null,unitcost decimal(10,2) null,qty int(11) not null,primary key (productid)
);

create table orders (orderid int(11) not null auto_increment,userid char(6) not null,orderdate datetime not null,totalprice decimal(10,2) default null,status tinyint(1) default null,primary key (orderid)
);

create table lineitem (orderid int(11) not null,itemid char(10) not null,quantity int(11) not null,unitprice decimal(10,2) not null,primary key (orderid,itemid)
);

建立数据完整性约束—

-------3------

alter table productadd foreign key (catid)references category(catid)on delete restrict;

alter table ordersadd foreign key (userid)references account(userid)on delete restricton update restrict;

alter table lineitemadd foreign key (itemid)references product(productid)on delete cascadeon update cascade;

alter table lineitemadd foreign key (orderid)references orders(orderid)on delete cascade;

alter table account
add check(sex in ('男','女'));

数据插入-1-用户表-

--------4---------

insert into accountvalues('u0001','刘晓和','123456','男','广东深圳市','liuxh@163.com','17885091066');

insert into accountvalues('u0002','张嘉庆','147369','男','广东深圳市','zhangjq@163.com','17885061235');

insert into accountvalues('u0003','李天威','131452','男','贵州毕节市','lixw@163.com','17885091065');

insert into accountvalues('u0004','陈浪','584145','女','广东珠海市','clang@163.com','16658461684');

insert into accountvalues('u0005','吴晶','852416','女','广东广州市','wjing@163.com','15599851352');

数据插入–2–商品分类表-

--------4---------

insert into category values('01','鸟类',' ');

insert into category values('02','猫',' ');

insert into category values('03','狗',' ');

insert into category values('04','鱼',' ');

insert into category values('05','爬行类',' ');

ERROR 1136 (21S01): Column count doesn’t match value count at row 1

出现这种报错是字段名与值不匹配，少写了值。

可能出现的情况为：

1.插入字段的时候字段名或者值少写了；

2.进行蠕虫复制的时候，想把部分字段名复制到另一张表当中，字段名或者值少写了。

把缺少的值添加上问题就解决了！

在Mysql8.0版本中可以插入空值，在后面写一个null就可以，在5.5版本中，不能插入空值

–正确–

insert into category values('01','鸟类');

insert into category values('02','猫');

insert into category values('03','狗');

insert into category values('04','鱼');

insert into category values('05','爬行类');

数据插入—3—商品表-
--------4---------

insert into productvalues('AV-CB-01','05','亚马逊鹦鹉','75岁以上高龄的好伙伴',50.00,60.00,100);

insert into productvalues('AV-SB-02','05','燕雀','非常好的减压宠物',45.00,50.00,98);

insert into productvalues('FI-FW-01','05','景丽','来自日本的淡水鱼',38.00,45.50,300);

insert into productvalues('FI-FW-02','01','金鱼','来自中国的淡水鱼',6.80,6.60,100);

insert into productvalues('FI-SW-01','01','天使鱼','来自澳大利亚的海水鱼',10.00,21.05,100);

insert into productvalues('FI-SW-02','01','海鲨','来自澳大利亚的海水鱼',20.05,32.00,200);

–注意：可再加：–

数据插入----4----订单表-

--------4---------

insert into orders values(20191010,'u0001','2022-01-20 20:10:08',52.00,0);

insert into orders values(20191011,'u0002','2022-01-21 10:30:20',66.50,0);

insert into orders values(20191012,'u0003','2022-01-22 12:20:06',88.88,0);

insert into orders values(20191013,'u0004','2022-01-23 16:16:20',99.00,1);

insert into orders values(20191014,'u0005','2022-01-26 20:20:20',100.00,0);

数据修改与删除-1-数据修改-

-----5-------

update product
set unitcost=(qty*unitcost+50*15)/(qty+50)
where name='天使鱼';

update product
set listprice=unitcost*1.2,qty=qty+50
where name='天使鱼';

–合并–

update product
set unitcost=(qty*unitcost+50*15)/(qty+50)
listprice = unitcost*1.2,qty=qty+50
where name='天使鱼';

–2–修改订单的状态–

update ordersset status=1where orderid='20191011';

–修改商品表的库存-*-

update lineitem,productset product.qty=product.qty-lineitem.quantitywhere lineitem.itemid=product.productidand lineitem.orderid='20191011';

–合并–

update orders,lineitem.productset orders.status=1,product.qty=product.qty-lineitem.quantitywhere orders.orderid=lineitem.orderidand lineitem.itemid=product.productidand orders.orderid='20191011';

ERROR 1049 (42000): Unknown database ‘lineitem’
--暂未解决--

–删除其所有订购信息，包括订单表和订单明细表的信息，涉及多表删除–

-*-delete orders,lineitemfrom orders,lineitemwhere orders.orderid=lineitem.idand orders.userid='u0004';-*-

—删除用户表中的用户记录—

-*-delete from account where userid='u0004';-*-

-----一次删除所有数据------

-*-delete account,orders,lineitemfrom account,orders,lineitemwhere account.userid=orders.useridand orders.orderid=lineitem.orderidand account.userid='u0004';-*-

数据查询

------6------------：
-----列查询----

select fullname as 姓名,address as 地址,phone as 电话 from account;

select distinct itemid,unitprice from lineitem;

select orderid,itemid,quantity*unitprice as 金额 from lineitem;

select fullname,case when sex='男' then '1'when sex='女' then '0'end as sex
from account;

（暂未）：

select name,casewhen unitcost < 500 then '抵挡商品'when unitcost >=500 and unitcost<1000 then '中档商品'else ‘高档商品'end as 档次
from product;

-----条件查询----

select userid,totalprice,status from orders where totalprice >=50;

select * from orderswhere orderdate >='2022-01-01' and orderdate <= '2022-02-20';

select fullname as 姓名,address as 地址,phone as 电话from account where sex='女';

select * from account where fullname like '吴%';

select * from orders where totalprice>=52 and totalprice<=99;

select * from product where productid like '%F____';

-----多表查询--------

select orderid,name,quantity from lineitemjoin product on(itemid=productid);

select fullname,totalprice from ordersjoin account on (orders.userid=account.userid)where totalprice>=88;

select * from orders join accounton (orders.userid=account.userid)where fullname='李天威';

select fullname,totalprice from ordersjoin account on (orders.userid=account.userid)where orderdate<='2022-02-02' and sex='女';

select orderid,userid,orderdate from orders
where orderid in(select orderid from lineitem where itemid='FI-FW-02');

select * from product where unitcost >=any(select unitcost from product where name='景丽');

-----分类汇总与排序------
1)统计客户总数：

select count(*) as 总人数 from account;

2)计算orders表中每单的平均价：

select avg(totalprice) as 每单平均价 from orders;

3)计算orders表中的成交总额：

select sum(totalprice) as 成交总额 from orders;

4)显示orders表中的单笔最高成交额和最低成交额。

select max(totalprice) as 最高成交额,min(totalprice) as 最低成交额from orders;

5)按性别统计客户人数：

select sex,count(*) from account group by sex;

6）按商品类别统计各类商品总数、平均单价：

select catid,sum(qty),avg(unitcost) from product group by catid;

7)将客户信息按电话号码从大到小排序。

select * from account order by phone desc;

8)将orders表按用户号从小到大排序，用户号相同的按订单日期从大到小排序：

select * from orders order by userid,orderdate desc;

9)显示lineitem表中商品的购买总数量超过2件的商品号和购买总数量，并按购买数量从小大大排序：(暂未）：

select itemid,sum( quantity ) from lineitemgroup by itemidhaving sum ( quantity ) >=2order by sum( quantity );

-----------7--------

-字段名用中文表示-

create view account_v1
as(select userid as 用户号,fullname as 姓名,password as 密码,sex as 性别,phone as 电话from account where sex='男')with check option;

select * from account_v1;

–查询客户信息–

select * from account_v1 where 姓名 like '李%';

—创建视图—

create view orders_v2
as(select orderid,fullname,address,orderdate,totalpricefrom orders join accounton (orders.userid=account.userid) );

select * from orders_v2;

----查询订单----

select * from orders_v2 where year(orderdate)=2022;

-----创建并查询视图------

create view lineitem_v3
as(select name,orderdate,quantity,unitpricefrom lineitemjoin orders on (lineitem.orderid=orders.orderid)join product on (lineitem.itemid=product.productid) );

—多余—

select * from lineitem_v3;

insert into account_v1values('u0007','陈薇','131452','男','15984247598');

update orders_v2 set totalprice=totalprice+200where orderid=20191012;

删除视图-1

delete from account_v1 where 用户号='u0009';

drop view order_v2,linitem_v3;

--------7----------

-1-

create index I_em_ind on account(email desc);

create index C_fa_ind on account(fullname,address);

create unique index U_na_ind on product(name(4));

–2–

alter table categoryadd primary key(catid),add unique U_ca_ind(catname);

ERROR 1068 (42000): Multiple primary key defined

错误原因：定义了两次主键；

解决办法：去掉主键：primary key;

alter table lineitemadd primary key(orderid,itemid),add index C_qu_ind(quantity,unitprice);

*–上同--

alter table accountadd primary key(userid),add unique U_fu_ind(fullname);

–*–同上–

—3—

create table shopcat(shopcatid int(11) not null primary key,userid char(10) not null,itemid char(10) not null,quantity int(11) not null,unitprice decimal(10,2) not null,index C_up_ind( userid,itemid )
);

show index from shopcat;

–*–

drop index C_up_ind on shopcat;

---

alter table orders partition by Key() partitions 3;

ERROR 1506 (HY000): Foreign keys are not yet supported in conjunction with partitioning

错误 1506年：尚未支持将外键与分区 SQL 语句：更改表。按哈希（id）分区

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