215 lines
6.3 KiB
TeX
215 lines
6.3 KiB
TeX
|
\documentclass[全部作业]{subfiles}
|
|||
|
|
\input{mysubpreamble}
|
|||
|
|
|
|||
|
|
\begin{document}
|
|||
|
|
\setcounter{chapter}{4}
|
|||
|
|
\chapter{第四次作业}
|
|||
|
|
\begin{enumerate}
|
|||
|
|
\questionandanswer[]{
|
|||
|
|
一、数据库介绍
|
|||
|
|
|
|||
|
|
Sakila 是一个由MySQL官方提供的示例数据库，主要设计用于电影租赁商店的业务场景。
|
|||
|
|
|
|||
|
|
Sakila数据库中，每个表的具体字段请参考官方文档中5.1 Tables中的解释：https://downloads.mysql.com/docs/sakila-en.a4.pdf
|
|||
|
|
|
|||
|
|
二、数据导入
|
|||
|
|
|
|||
|
|
1. 在Navicat中创建一个新的数据库，命名为sakila。
|
|||
|
|
|
|||
|
|
2. 导入表结构与数据：
|
|||
|
|
|
|||
|
|
方法一：右键新创建好的sakila数据库，选择“运行SQL文件”：
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
在文件一栏中，先选择sakila-schema.sql文件进行导入，导入成功后关闭“运行SQL文件”的界面；
|
|||
|
|
|
|||
|
|
同样的方法，再选择sakila-data.sql文件进行导入。
|
|||
|
|
|
|||
|
|
刷新数据库，检查表与表中的数据是否成功导入。
|
|||
|
|
|
|||
|
|
方法二：右键新创建好的sakila数据库，选择“命令列界面”。
|
|||
|
|
|
|||
|
|
执行如下两行命令：
|
|||
|
|
|
|||
|
|
“source /Downloads/sakila-db/sakila-schema.sql;”
|
|||
|
|
|
|||
|
|
“source /Downloads/sakila-db/sakila-data.sql;”
|
|||
|
|
|
|||
|
|
刷新数据库，检查表与表中的数据是否成功导入。
|
|||
|
|
|
|||
|
|
|
|||
|
|
三、写出下面的查询语句，并保存到“实验五.docx”文件中。要求文件中除了提交SQL语句，还需有SQL语句对应的执行结果。
|
|||
|
|
}{
|
|||
|
|
|
|||
|
|
}
|
|||
|
|
\questionandanswer[]{
|
|||
|
|
请为 `rental` 表中的 `inventory_id` 添加一个外键约束，确保其引用 `inventory` 表中的 `inventory_id`，并且当 `inventory` 表中的记录被删除时，相应的 `rental` 记录也被删除。
|
|||
|
|
}{}
|
|||
|
|
{\kaishu
|
|||
|
|
\begin{minted}{SQL}
|
|||
|
|
alter table rental add foreign key (inventory_id) references inventory (inventory_id) on delete cascade;
|
|||
|
|
\end{minted}
|
|||
|
|
\begin{minted}{text}
|
|||
|
|
417 ms 中有 16,044 行受到影响
|
|||
|
|
\end{minted}
|
|||
|
|
}
|
|||
|
|
\questionandanswer[]{
|
|||
|
|
在 `customer` 表中添加一个检查约束，确保 `active` 列的值只能是 0 或 1。
|
|||
|
|
}{}
|
|||
|
|
{\kaishu
|
|||
|
|
\begin{minted}{SQL}
|
|||
|
|
alter table customer add check ( active in (0, 1) );
|
|||
|
|
\end{minted}
|
|||
|
|
\begin{minted}{text}
|
|||
|
|
102 ms 中有 599 行受到影响
|
|||
|
|
\end{minted}
|
|||
|
|
}
|
|||
|
|
\questionandanswer[]{
|
|||
|
|
创建一个名为 `sakila_user` 的数据库用户，并授予其对 `film` 表的 SELECT 和 UPDATE 权限。
|
|||
|
|
}{}
|
|||
|
|
{\kaishu
|
|||
|
|
\begin{minted}{SQL}
|
|||
|
|
create user sakila_user identified by random password;
|
|||
|
|
grant select, update on film to sakila_user;
|
|||
|
|
\end{minted}
|
|||
|
|
\begin{csv}
|
|||
|
|
,user,host,generated password
|
|||
|
|
1,sakila_user,\%,""
|
|||
|
|
\end{csv}
|
|||
|
|
\begin{minted}{text}
|
|||
|
|
在 49 ms (execution: 36 ms, fetching: 13 ms) 内检索到从 1 开始的 1 行
|
|||
|
|
在 33 ms 内完成
|
|||
|
|
\end{minted}
|
|||
|
|
}
|
|||
|
|
\questionandanswer[]{
|
|||
|
|
从 `sakila_user` 用户收回对 `film` 表的 UPDATE 权限。
|
|||
|
|
}{}
|
|||
|
|
{\kaishu
|
|||
|
|
\begin{minted}{SQL}
|
|||
|
|
revoke update on film from sakila_user;
|
|||
|
|
\end{minted}
|
|||
|
|
\begin{minted}{text}
|
|||
|
|
在 39 ms 内完成
|
|||
|
|
\end{minted}
|
|||
|
|
}
|
|||
|
|
\questionandanswer[]{
|
|||
|
|
查询每个影片的租赁次数（包括影片名称），并按租赁次数降序排列。
|
|||
|
|
}{}
|
|||
|
|
{\kaishu
|
|||
|
|
\begin{minted}{SQL}
|
|||
|
|
select film.title, count(*) as 租赁次数
|
|||
|
|
from film
|
|||
|
|
join inventory using (film_id)
|
|||
|
|
join rental using (inventory_id)
|
|||
|
|
group by film.title
|
|||
|
|
order by 租赁次数 desc;
|
|||
|
|
\end{minted}
|
|||
|
|
\begin{csv}
|
|||
|
|
,title,租赁次数
|
|||
|
|
1,BUCKET BROTHERHOOD,34
|
|||
|
|
2,ROCKETEER MOTHER,33
|
|||
|
|
3,FORWARD TEMPLE,32
|
|||
|
|
4,GRIT CLOCKWORK,32
|
|||
|
|
5,JUGGLER HARDLY,32
|
|||
|
|
$\cdots$,$\cdots$,$\cdots$
|
|||
|
|
954,SEVEN SWARM,5
|
|||
|
|
955,TRAFFIC HOBBIT,5
|
|||
|
|
956,HARDLY ROBBERS,4
|
|||
|
|
957,MIXED DOORS,4
|
|||
|
|
958,TRAIN BUNCH,4
|
|||
|
|
\end{csv}
|
|||
|
|
}
|
|||
|
|
\questionandanswer[]{
|
|||
|
|
查询每个影片类别的租赁次数，并找出租赁次数最多的类别。
|
|||
|
|
}{}
|
|||
|
|
{\kaishu
|
|||
|
|
\begin{minted}{SQL}
|
|||
|
|
select category.name, count(*) as 租赁次数
|
|||
|
|
from category
|
|||
|
|
join film_category using (category_id)
|
|||
|
|
join inventory using (film_id)
|
|||
|
|
join rental using (inventory_id)
|
|||
|
|
group by category.name
|
|||
|
|
order by 租赁次数 desc;
|
|||
|
|
\end{minted}
|
|||
|
|
\begin{csv}
|
|||
|
|
,name,租赁次数
|
|||
|
|
1,Sports,1179
|
|||
|
|
2,Animation,1166
|
|||
|
|
3,Action,1112
|
|||
|
|
4,Sci-Fi,1101
|
|||
|
|
5,Family,1096
|
|||
|
|
6,Drama,1060
|
|||
|
|
7,Documentary,1050
|
|||
|
|
8,Foreign,1033
|
|||
|
|
9,Games,969
|
|||
|
|
10,Children,945
|
|||
|
|
11,Comedy,941
|
|||
|
|
12,New,940
|
|||
|
|
13,Classics,939
|
|||
|
|
14,Horror,846
|
|||
|
|
15,Travel,837
|
|||
|
|
16,Music,830
|
|||
|
|
\end{csv}
|
|||
|
|
|
|||
|
|
可以看到租赁次数最多的类别是Sports。
|
|||
|
|
}
|
|||
|
|
\questionandanswer[]{
|
|||
|
|
查询每位客户的总支出金额（租赁费用），并按总支出金额降序排列。
|
|||
|
|
}{}
|
|||
|
|
{\kaishu
|
|||
|
|
\begin{minted}{SQL}
|
|||
|
|
select concat(customer.first_name, " ", customer.last_name) 客户名称,
|
|||
|
|
sum(amount) 总支出金额
|
|||
|
|
from customer
|
|||
|
|
join payment using (customer_id)
|
|||
|
|
group by customer_id
|
|||
|
|
order by 总支出金额 desc;
|
|||
|
|
\end{minted}
|
|||
|
|
\begin{csv}
|
|||
|
|
,客户名称,总支出金额
|
|||
|
|
1,KARL SEAL,221.55
|
|||
|
|
2,ELEANOR HUNT,216.54
|
|||
|
|
3,CLARA SHAW,195.58
|
|||
|
|
4,RHONDA KENNEDY,194.61
|
|||
|
|
5,MARION SNYDER,194.61
|
|||
|
|
$\cdots$,$\cdots$,$\cdots$
|
|||
|
|
595,ANNIE RUSSELL,58.82
|
|||
|
|
596,JOHNNY TURPIN,57.81
|
|||
|
|
597,BRIAN WYMAN,52.88
|
|||
|
|
598,LEONA OBRIEN,50.86
|
|||
|
|
599,CAROLINE BOWMAN,50.85
|
|||
|
|
\end{csv}
|
|||
|
|
}
|
|||
|
|
\questionandanswer[]{
|
|||
|
|
查询出超过 6 个月没有被租赁的影片名称。
|
|||
|
|
}{}
|
|||
|
|
{\kaishu
|
|||
|
|
这些影片的租赁日期都是2005年的，如果说是距离现在的话那都是超过6个月的了。但是按照题意那应该是这样写，所以筛选出了全部的电影名称。
|
|||
|
|
\begin{minted}{SQL}
|
|||
|
|
select film.title
|
|||
|
|
from film
|
|||
|
|
where not exists(select *
|
|||
|
|
from rental
|
|||
|
|
right join inventory using (inventory_id)
|
|||
|
|
where film.film_id = inventory.film_id
|
|||
|
|
and rental_date >= date_sub(current_date, interval 6 month));
|
|||
|
|
\end{minted}
|
|||
|
|
\begin{csv}
|
|||
|
|
,title
|
|||
|
|
1,ACADEMY DINOSAUR
|
|||
|
|
2,ACE GOLDFINGER
|
|||
|
|
3,ADAPTATION HOLES
|
|||
|
|
4,AFFAIR PREJUDICE
|
|||
|
|
5,AFRICAN EGG
|
|||
|
|
$\cdots$,$\cdots$
|
|||
|
|
996,YOUNG LANGUAGE
|
|||
|
|
997,YOUTH KICK
|
|||
|
|
998,ZHIVAGO CORE
|
|||
|
|
999,ZOOLANDER FICTION
|
|||
|
|
1000,ZORRO ARK
|
|||
|
|
\end{csv}
|
|||
|
|
}
|
|||
|
|
\end{enumerate}
|
|||
|
|
\end{document}
|