COEN 280 – Database Systems
Homework Assignment 3
Due: Friday, Nov [email protected]:59pm
Demo: Saturday, Nov 23
In your course project you would develop a data analysis application for Yelp.com’s business review data.
The emphasis would be on the database infrastructure of the application.
In 2013, Yelp.com has announced the “Yelp Dataset Challenge” and invited students to use this data in an
innovative way and break ground in research. In this project you would query this dataset to extract useful
information for local businesses and individual users.
The Yelp data is available in JSON format. The original Yelp dataset includes 42,153 businesses, 252,898 users,
and 1,125,458 reviews from Phoenix (AZ), Las Vegas (NV), Madison (WI) in United States and Waterloo (ON)
and Edinburgh (ON) in Canada. (http://www.yelp.com/dataset_challenge/). In your project you will use a smaller
and simplified dataset. This simplified dataset includes only 20,544 businesses, the reviews that are written for
those businesses only, and the users that wrote those reviews.
The Yelp JSON files that you will use in this project are available on Camino.
(Note: Please make sure to use the dataset available on Camin, not the one from the Yelp.com website)
See Appendix-A for an overview of the Yelp Academic Dataset.
Overview & Requirements:
You would develop a target application which runs queries on the Yelp data and extracts useful information. The
primary users for this application will be potential customers seeking for businesses that match their search
criteria. Your application will have a user interface that supports business search based on business categories
(main and sub-categories) and the attributes associated with each business category. Different business
characteristics such as main category(ies), sub-category(ies), business attributes, days of the week, and hours of
a day that the business is operating can be utilized as the search criteria. The application should also allow the
user to not only view the business that match the selected criteria, but also view reviews provided for each
Faceted search has become a popular technique in commercial search applications, particularly for online
retailers and libraries. It is a technique for accessing information organized according to a faceted classification
system, allowing users to explore a collection of information by applying multiple filters. Faceted search is the
dynamic clustering of items or search results into categories that let users drill into search results (or even skip
searching entirely) by any value in any field. Users can then “drill down” by applying specific constraints to the
search results. Look at https://react.rocks/tag/Faceted_Search for some examples.
In this application, the user can filter the search results using available business attributes (i.e. facets) such as
main category(ies), sub-category(ies), business attributes, days of the week, and hours of a day. Each time the
user clicks on a facet value; the set of results is reduced to only the items that have that value. Additional clicks
continue to narrow down the search—the previous facet values are remembered and applied again.
You will be designing your application as a standalone Java application.
Example screenshots of a possible application GUI are available in Appendix-B. In evaluating your work,
instructor’s primary focus will be primarily on how you design your database and how efficiently you can search
the database and pull out the information. However, your GUI should provide the basic functionality for easy
browsing of the movie categories and attributes (as illustrated in Appendix-B). Creativity is encouraged!
0. Part 0
– Install Oracle Database 11gR2 or later. Consult the instructions provided on Camino under Assignment 3.
You will be installing a docket container with an Oracle Database install on this environment that you will
be using for your assingment.
I. Part 1
– Download the Yelp dataset from Camino. Look at each JSON file and understand what information the data
objects provide. Pay attention to the data items in JSON objects that you will need for your application (For
example, categories, attributes,…etc.)
– You may have to modify your database design from Homework 2 to model the database for the described
application scenario on page-1. Your database schema doesn’t necessarily need to include all the data items
provided in the data files. Your schema should be precise yet complete. It should be designed in such a way
that all queries/data retrievals on/from the database run efficiently and effectively.
– Produce DDL SQL statements for creating the corresponding tables in a relational DBMS. Note the
constraints, including key constraints,referential integrity constraints, not NULL constraints, etc. needed for
the relational schema to capture and enforce the semantics of your ER design.
– Populate your database with the dataset. Generate INSERT statements for your tables and run those to
insert data into your DB.
– After you populated your database, created indexes on frequently accessed columns of its tables using
CREATE INDEX statement. This will help speed up query execution times. You have some flexibility
about which indexes to choose.
II. Part 2
Implement the application for searching businesses as explained in section “Overview & Requirements”. In this
milestone you would:
• Write the SQL queries to search your database.
• Establish connectivity with the DBMS.
• Embed/execute queries in/from the code. Retrieve query results and parse the returned results to generate the
output that will be displayed on the GUI.
• Business Search: Implement a GUI where the user can search for businesses that match the criteria given.
o Browse through categories, subcategories, and attributes for the businesses (See Appendix C);
select the business attributes that user wants to search for;
o The usage flow of the GUI is as follows:
1) Once the application is loaded, main categories values are loaded from the backend database.
note: The list of the main categories is given in Appendix-C. All other categories that appear in
the business objects are sub-categories. Such a distinction is made for easier browsing of the
2) The user is required to select at least one main categories value. To make the usage flow clearer,
an example selection is provided at each step. For instance, assume that use selects Restaurants as
the main category.
3) The sub-categories matching the previous main category(ies) selection will be listed under the
Business Sub-categories panel. Since user selected Restaurants in previous step, only sub-categories
values that its main category is Restaurants should appear in the sub-categories panel. Note how
faceted search work here. After step 2, the set of results is reduced to only the businesses that belong
to Restaurants category. The user can select desired sub-categories values. This attribute is optional
in building the query. User might not select a sub-category at all. Assume that use
selects Mediterranean as the sub-category value.
4) Business attributes are the next selection. This attribute is also optional in building the query.
Since user selected Restaurants, and Mediterranean in previous steps, only attribute values that
appeared in business with main-category = Restaurants AND sub-category = Mediterranean, should
appear in the attribute selection panel. Assume that user selects Outdoor Sitting as the desired
5) The specific state and city of the business corresponding to the previous selections will
appear in “Location” drop down menu (Not shown in Appendix-B). This attribute is also optional in
building the query.
Since user selected Restaurants, and Mediterranean and Outdoor Sitting in previous steps, only
location (city,state) values of businesses with main-category = Restaurants AND sub-category =
Mediterranean AND those that provide Outdoor Sittings should appear in the location dropdown
menu. Assume that user selects Phoenix, AZ as the desired location.
6) The operation days of the business corresponding to the previous selections will be appeared in
“Day of week” drop down menu. Also, the operation time of the business corresponding to the
previous selections will be appeared in the From/To dropdown menus. These attributes are also
optional in building the query. Based on previous selections, operation days and times
corresponding to businesses with main-category = Restaurants AND sub-category = Mediterranean
AND those that provide Outdoor Sittings, should appear in days of week and from/to menus.
Note that the values for days of week and times of day (from/to) should also be populated in a
faceted manner. Do NOT assume that you can initialize day of week values with 7 days a week, and
operation time from/to values with 24 hours a day.
o The application should be able to search for the businesses that have either all the specified values
(AND condition) or that have any of the values specified (ORcondition). For example:
• if user selected AND condition, and selected Restaurants and Cafes as main categories,
sub-categories of businesses that have Restaurants AND Cafes as main categories,
should be listed in the next panel.
• If user selected OR condition, and selected Restaurants and Cafes as main categories,
sub-categories of businesses that have Restaurants OR Cafes as main categories,
should be listed in the next panel.
Note that the relation between facets (or business characteristics) is always AND. However, the
relation between values of one facet can be set to be OR or AND.
o select a certain business in the search results and list all the reviews for that business. (note: The
review list should also include the names of the users who provided those reviews)
Consider the below example on the AND/OR selection. Assume the following example:
BusinessID Category Sub-category
1 restaurant Mediterranean
2 restaurant Mexican
3 restaurant Mediterranean
Suppose User selects Restaurant as main category and both Mediterranean and Mexican as sub-category. Also user
selects AND from the “Search for” drop down menu. This means that attributes of businesses that are (Restaurant,
Mediterranean) AND (Restaurant, Mexican) should appear in the attribute column.
So you have to look for the conjunction of attributes between business 1 , 2 , 3 that follow the above rule.
Per above example the following attributes should show in the attribute panel since they are common between all
three businesses: (remember that user selected AND from the “Search for” drop down menu)
Suppose User selects Restaurant as main category and both Mediterranean and Mexican as sub-category.
Also user selects OR from the “Search for” drop down menu.
This means that attributes of business that are (Restaurant, Mediterranean) OR (Restaurant, Mexican) should
appear in the attribute column. So you have to look for disjunction of attributes between business 1 , 2 , 3 that
follow the above rule.
Per above example, what shows in attribute panel is:
Please note that all data displayed on the GUI should be kept in the database and should be retrieved from it
when needed. You are not allowed to create internal data structures to store data.
Required .sql files:
You are required to create two .sql files:
1. createdb.sql: This file should create all required tables. In addition, it should include constraints, indexes, and any
other DDL statements you might need for your application.
2. dropdb.sql: This file should drop all tables and the other objects once created by your createdb.sql file.
Required Java Programs:
You are required to implement two Java programs:
1. populate.java: This program should get the names of the input files as command line parameters and
populate them into your database. It should be executed as:
> java populate yelp_business.json yelp_review.json yelp_checkin.json yelp_user.json
Note that every time you run this program, it should remove the previous data in your tables; otherwise the
tables will have redundant data.
2. hw3.java: This program should provide a GUI, similar to figure 1, to query your database. The GUI should
a. List of main business categories.
b. List of sub-categories associated with the selected main category(ies).
c. List of the attributes associated with the selected sub-categories.
d. 3 dropdown menus to filter results based on days and hours the business is open.
e. List of business results
i. Results should include business id, address, city, state, stars, number of reviews, number of
ii. List of the reviews provided for a specific business.
Pre-processing of Categories and Sub-categories
You need to read yelp_business.json file line by line and parse each like as a JOSN. The JSON has an attribute
called “categories”. You need to pre-process data and create a sub-category list for each main category. Main
categories are defined in Appendix C.
For example, consider the following businesses in the Yelp dataset with their categories attribute:
• Business 1: “categories”: [“Diners”, “Restaurants”]
• Business 2: “categories”: [“Burgers”, “Restaurants”]
• Business 3: “categories”: [“Fast Food”, “Restaurants”]
• Business 4: “categories”: [“Burgers”, “Fast Food”, “Restaurants”]
• Business 5: “categories”: [“American (Traditional)”, “Restaurants”]
From Appendix C, we see that “Restaurants” is a main category. Other entries in “categories” list should be
considered as sub-categories of restaurants. As a result “Diners”, “Burgers”, “Fast Food”, and “American
(Traditional)” are sub-categories.
You need to read the business data in a pre-processing step and create the list of sub-categories for each main
1. Yelp Dataset Challenge, http://www.yelp.com/dataset_challenge/
2. Samples for users of the Yelp Academic Database,https://github.com/Yelp/dataset-examples
Yelp’s Academic Dataset
Yelp has made available a dataset which contains user reviews for 42,153 businessesin Phoenix (AZ), Las Vegas
(NV), Madison (WI) in United States and Waterloo (ON) and Edinburgh (ON) in Canada. The purpose was to
provide a real-world data set to promote research in various areas of research. The dataset includes 5 types of data
objects: business, review, user, tip, and check-in. Every object contains a ‘type’ field, which tells whether it is a
business, a user, or a review. Business objects contain basic information about local businesses. Review objects
contain the details of the reviews by users for the businesses. Review’s user_id associates the reviews with the
user objects. Similarly, review’s business_id associates each review with the businesses.
The fields of objects are given below:
Business objects contain basic information about local businesses.
‘business_id’: (encrypted business id),
‘full_address’: (localized address),
‘hours’: (the days of the week when business is open; the opening and closing times on those days)
‘open’: True / False (corresponds to closed, not business hours),
‘categories’: (categories associated with the business)
‘review_count’: review count,
‘name’: (business name),
‘neighborhoods’: [(hood names)],
‘stars’: (star rating, rounded to half-stars),
‘attributes’: (business properties),
Review objects contain the review text, the star rating, and information on votes Yelp users have cast on the
review. Use user_id to associate this review with others by the same user. Use business_id to associate this review
with others of the same business.
‘useful’: (count of useful votes),
‘funny’: (count of funny votes),
‘cool’: (count of cool votes)
‘user_id’: (the identifier of the authoring user),
‘review_id’: (the identifier of the reviewed business),
‘stars’: (star rating, integer 1-5),
‘date’: (date, formatted like ‘2011-04-19’),
‘text’: (review text),
‘business_id’: (the identifier of the reviewed business)
User objects contain aggregate information about a single user across all of Yelp (including businesses and
reviews not in this dataset).
‘yelping_since’: (the date when user account was created)
‘useful’: (count of useful votes across all reviews),
‘funny’: (count of funny votes across all reviews),
‘cool’: (count of cool votes across all reviews)
‘review_count’: (review count),
‘name’: (first name, last initial, like ‘Matt J.’),
‘user_id’: (unique user identifier),
‘friends’: (friends of the user),
‘fans’: (number fans of the user),
‘average_stars’: (floating point average, like 4.31),
‘compliments’: (comments from other users),
‘business_id’: (encrypted business id),
‘0-0’: (number of checkins from 00:00 to 01:00 on all Sundays),
‘1-0′: (number of checkins from 01:00 to 02:00 on all Sundays),
’14-4′: (number of checkins from 14:00 to 15:00 on all Thursdays),
’23-6’: (number of checkins from 23:00 to 00:00 on all Saturdays)
} # if there was no checkin for a hour-day block it will not be in the list
‘user_id’: (encrypted user id),
‘business_id’: (encrypted user id),
Figure 1- List the main categories that appear in “business” data.
Figure 2 – List the sub-categories associated with the selected main category(ies). List the attributes associated with
the selected sub-categories.
Figure 3 – Search for businesses for the selected sub-categories which have “all” the selected attributes and which are
open on Saturday between 6PM and 9PM.
Figure 4 – When clicked on a business, the reviews provided for that business and the users who wrote those reviews
Main Business Categories
1. Active Life
2. Arts & Entertainment
4. Car Rental
6. Beauty & Spas
7. Convenience Stores
11. Department Stores
13. Event Planning & Services
14. Flowers & Gifts
16. Health & Medical
17. Home Services
18. Home & Garden
20. Hotels & Travel
21. Hardware Stores
23. Medical Centers
24. Nurseries & Gardening
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