数据库系统原理与实践——完成第五次作业
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数据库系统原理与实践/平时作业/第五次作业.tex
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数据库系统原理与实践/平时作业/第五次作业.tex
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\documentclass[全部作业]{subfiles}
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\input{mysubpreamble}
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\begin{document}
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\setcounter{chapter}{4}
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\chapter{第四次作业}
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\begin{enumerate}
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\questionandanswer[]{
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一、数据库介绍
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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。
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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
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二、数据导入
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1. 在Navicat中创建一个新的数据库,命名为sakila。
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2. 导入表结构与数据:
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方法一:右键新创建好的sakila数据库,选择“运行SQL文件”:
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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;
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同样的方法,再选择sakila-data.sql文件进行导入。
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刷新数据库,检查表与表中的数据是否成功导入。
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方法二:右键新创建好的sakila数据库,选择“命令列界面”。
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执行如下两行命令:
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“source /Downloads/sakila-db/sakila-schema.sql;”
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“source /Downloads/sakila-db/sakila-data.sql;”
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刷新数据库,检查表与表中的数据是否成功导入。
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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。
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}{
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}
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\questionandanswer[]{
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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。
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}{}
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{\kaishu
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\begin{minted}{SQL}
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alter table rental add foreign key (inventory_id) references inventory (inventory_id) on delete cascade;
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\end{minted}
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\begin{minted}{text}
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417 ms 中有 16,044 行受到影响
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\end{minted}
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}
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\questionandanswer[]{
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在 `customer` 表中添加一个检查约束,确保 `active` 列的值只能是 0 或 1。
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}{}
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{\kaishu
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\begin{minted}{SQL}
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alter table customer add check ( active in (0, 1) );
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\end{minted}
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\begin{minted}{text}
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102 ms 中有 599 行受到影响
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\end{minted}
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}
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\questionandanswer[]{
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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。
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}{}
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{\kaishu
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\begin{minted}{SQL}
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create user sakila_user identified by random password;
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grant select, update on film to sakila_user;
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\end{minted}
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\begin{csv}
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,user,host,generated password
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1,sakila_user,\%,""
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\end{csv}
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\begin{minted}{text}
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在 49 ms (execution: 36 ms, fetching: 13 ms) 内检索到从 1 开始的 1 行
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在 33 ms 内完成
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\end{minted}
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}
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\questionandanswer[]{
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从 `sakila_user` 用户收回对 `film` 表的 UPDATE 权限。
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}{}
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{\kaishu
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\begin{minted}{SQL}
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revoke update on film from sakila_user;
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\end{minted}
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\begin{minted}{text}
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在 39 ms 内完成
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\end{minted}
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}
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\questionandanswer[]{
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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。
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}{}
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{\kaishu
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\begin{minted}{SQL}
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select film.title, count(*) as 租赁次数
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from film
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join inventory using (film_id)
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join rental using (inventory_id)
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group by film.title
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order by 租赁次数 desc;
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\end{minted}
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\begin{csv}
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,title,租赁次数
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1,BUCKET BROTHERHOOD,34
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2,ROCKETEER MOTHER,33
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3,FORWARD TEMPLE,32
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4,GRIT CLOCKWORK,32
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5,JUGGLER HARDLY,32
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$\cdots$,$\cdots$,$\cdots$
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954,SEVEN SWARM,5
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955,TRAFFIC HOBBIT,5
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956,HARDLY ROBBERS,4
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957,MIXED DOORS,4
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958,TRAIN BUNCH,4
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\end{csv}
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}
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\questionandanswer[]{
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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。
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}{}
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{\kaishu
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\begin{minted}{SQL}
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select category.name, count(*) as 租赁次数
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from category
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join film_category using (category_id)
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join inventory using (film_id)
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join rental using (inventory_id)
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group by category.name
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order by 租赁次数 desc;
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\end{minted}
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\begin{csv}
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,name,租赁次数
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1,Sports,1179
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2,Animation,1166
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3,Action,1112
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4,Sci-Fi,1101
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5,Family,1096
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6,Drama,1060
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7,Documentary,1050
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8,Foreign,1033
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9,Games,969
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10,Children,945
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11,Comedy,941
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12,New,940
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13,Classics,939
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14,Horror,846
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15,Travel,837
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16,Music,830
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\end{csv}
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可以看到租赁次数最多的类别是Sports。
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}
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\questionandanswer[]{
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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。
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}{}
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{\kaishu
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\begin{minted}{SQL}
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select concat(customer.first_name, " ", customer.last_name) 客户名称,
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sum(amount) 总支出金额
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from customer
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join payment using (customer_id)
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group by customer_id
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order by 总支出金额 desc;
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\end{minted}
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\begin{csv}
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,客户名称,总支出金额
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1,KARL SEAL,221.55
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2,ELEANOR HUNT,216.54
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3,CLARA SHAW,195.58
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4,RHONDA KENNEDY,194.61
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5,MARION SNYDER,194.61
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$\cdots$,$\cdots$,$\cdots$
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595,ANNIE RUSSELL,58.82
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596,JOHNNY TURPIN,57.81
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597,BRIAN WYMAN,52.88
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598,LEONA OBRIEN,50.86
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599,CAROLINE BOWMAN,50.85
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\end{csv}
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}
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\questionandanswer[]{
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查询出超过 6 个月没有被租赁的影片名称。
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}{}
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{\kaishu
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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。
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\begin{minted}{SQL}
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select film.title
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from film
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where not exists(select *
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from rental
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right join inventory using (inventory_id)
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where film.film_id = inventory.film_id
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and rental_date >= date_sub(current_date, interval 6 month));
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\end{minted}
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\begin{csv}
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,title
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1,ACADEMY DINOSAUR
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2,ACE GOLDFINGER
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3,ADAPTATION HOLES
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4,AFFAIR PREJUDICE
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5,AFRICAN EGG
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$\cdots$,$\cdots$
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996,YOUNG LANGUAGE
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997,YOUTH KICK
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998,ZHIVAGO CORE
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999,ZOOLANDER FICTION
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1000,ZORRO ARK
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\end{csv}
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}
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\end{enumerate}
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\end{document}
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