MET CS 669 Lab 3: Aggregating Data
MET CS 669 Database Design and Implementation for Business
Lab 3: Aggregating Data
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Copyright 2019 Boston University. All Rights Reserved.
Overview of the Lab
Sometimes we are interested in the result of aggregating multiple data items rather
than in individual data items. For example, a store may be interested in the monetary
amount of a single sale, but may be equally or more interested in the sum the
monetary amount of all sales that occurred on a specific day. SQL provides many
useful ways to aggregate data. The objective of this lab is for you to learn to
aggregate data using SQL.
From a technical perspective, together, we will learn:
how to use aggregate functions generally.
how to count items in a table.
how to determine minimum and maximum values.
how to filter rows based upon aggregate values.
how to use aggregation with joins together to answer more complex use cases
with related data.
Lab 3 Explanations Reminder
As a reminder, it is important to read through the Lab 3 Explanation document to
successfully complete this lab, available in the assignment inbox alongside this lab.
The explanation document illustrates how to correctly execute each SQL construct
step-by-step, and explains important theoretical and practical details.
Other Reminders
The examples in this lab will execute in modern versions of Oracle, Microsoft
SQL Server, and PostgreSQL as is.
The screenshots in this lab display execution of SQL in the default SQL clients
supported in the course – Oracle SQL Developer, SQL Server Management
Studio, and pgAdmin – but your screenshots may vary somewhat as different
version of these clients are released.
Don’t forget to commit your changes if you work on the lab in different
sittings, using the “COMMIT” command, so that you do not lose your work.
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Section One – Aggregating Data
To practice aggregating data, you will be working with the following simplified Movie
Series schema.
This schema contains basic information about various movie series and the movies that
comprise them, such as the Star Wars series with its movies.
In this schema, the Movie_series table represents the overall movie series, and contains
a primary key, the name of the series, foreign keys to its genre and creator, and a
suggested price for the entire series. The Genre table represents the genre of a movie
such as “Fantasy”, “Family Film”, and the like. It contains a primary key and the name of
the genre. The Creator table represents who created the series, and contains a primary
key and the name of each creator. The Movie table represents movies that comprise
each movie series, and contains a primary key, a foreign key to the movie’s series, the
name of the movie, and the length of the movie, in minutes.
The schema is intentionally simplified compared to what you might see in a real-world
production schema. Many attributes and entities that would exist in a production
database are not present. Nevertheless, there is sufficient complexity in the existing
relationships and attributes to challenge you to learn various aggregation scenarios you
encounter in real-world schemas.
As a reminder, for each step that requires SQL, make sure to capture a screenshot of the
command and the results of its execution. Further, make sure to eliminate unneeded
Section Background
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columns from the result set, to name your columns something user-friendly and human
readable, and to format any prices as currencies.
1. Create the tables in the schema, including all of their columns, datatypes, and
constraints, and populate the tables with data. Most but not all of the data is given to
you in the table below; you should also insert information for one additional movie
series of your choosing. Although the data is in flattened representation below, you
will of course insert the data relationally into the schema with foreign keys
referencing the appropriate primary keys.
Genre Creator Series Suggested Price Movie Lengt
h
Fantasy George
Lucas
Star Wars $129.99 Episode I: The
Phantom Menace
136
Fantasy George
Lucas
Star Wars $129.99 Episode II: Attack of
the Clones
142
Fantasy George
Lucas
Star Wars $129.99 Episode III: Revenge
of the Sith
140
Fantasy George
Lucas
Star Wars $129.99 Episode IV: A New
Hope
121
Family Film John
Lasseter
Toy Story $22.13 Toy Story 121
Family Film John
Lasseter
Toy Story $22.13 Toy Story 2 135
Family Film John
Lasseter
Toy Story $22.13 Toy Story 3 148
Fantasy John Tolkien Lord of the
Rings
The Lord of the Rings:
The Fellowship of the
Ring
228
Fantasy John Tolkien Lord of the
Rings
The Lord of the Rings:
The Two Towers
235
Fantasy John Tolkien Lord of the
Rings
The Lord of the Rings:
The Return of the King
200
Note that the suggested price for the Lord of the Rings series is null (has no value).
2. A video reseller needs to know how many movies are available. Write a single query
to fulfill this request.
Section Steps
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3. The same video reseller needs to know the price of the most expensive and least
expensive series. Write two queries that fulfill this request, and also explain how and
why the SQL processor treated the suggested price for the Lord of the Rings series
differently than the other suggested price values.
4. A film production company is considering purchasing the rights to extend a series,
and needs to know the names and prices of all movie series, along with the number
of movies in each series. Write a single query to fulfill this request.
5. The same film production company wants to create movies in a genre that has at
least 7 associated movies. Write a single query to fulfill this request, making sure to
list only genres that have at least 7 associated movies, along with the number of
movies for the genre.
6. Boston University wants to offer its students a movie-binge weekend by playing every
movie in a series. To make sure the series is as bingeable as possible, BU wants to be
sure the series will run for at least 10 hours. Write a single query that gives this
information, with useful columns.
7. A research institution requests the names of all movie series’ creators, as well as the
number of “Family Film” movies they have created (even if they created none). The
institution wants the list to be ordered from most to least; the creator who created
the most family films will be at the top of the list, and the one with the least will be at
the bottom. Write a single query that gives this information, with useful columns.
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Evaluation
Your lab will be reviewed by your facilitator or instructor with the following criteria and
grade breakdown.
Criterion A B C DFLetter
Grade
Correctness and
Completeness of
Results (70%)
All steps' results are
entirely complete and
correct
About ¾ of the steps'
results are correct and
complete
About half of the steps'
results are correct and
complete
About ¼ of the steps'
results are correct and
complete
Virtually none of the
step's results are correct
and complete
Constitution of
SQL and
Explanations
(30%)
Excellent use and
integration of
appropriate SQL
constructs and
supporting
explanations
Good use and
integration of
appropriate SQL
constructs and
supporting
explanations
Mediocre use and
integration of
appropriate SQL
constructs and
supporting
explanations
Substandard use and
integration of
appropriate SQL
constructs and
supporting
explanations
Virtually all SQL
constructs and supporting
explanations are
unsuitable or improperly
integrated
Assignment Grade:#N/A
The resulting grade is calculated as a weighted average as listed using A+=100, A=96, A-=92, B+=88, B=85, B-=82 etc.
To obtain an A grade for the course, your weighted average should be >=95, A- >=90, B+ >=87, B >= 82, B- >= 80 etc.
Use the Ask the Facilitators Discussion Forum if you have any questions
regarding how to approach this lab. Make sure to include your name in the
filename and submit it in the Assignments section of the course.
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