SQL Database Case Studies

In this section, we will be looking at some real-world examples of how SQL databases are used. 

We will examine how they are designing and also how they are used to store and query data.

Case Study 1: Facebook

Facebook is a social networking site that allows users to connect with friends and share information such as status updates, photos, and videos. Facebook uses a relational database to store all of its data. This includes information on users, their friends, and the content they share. 

When you sign up for Facebook, you provide your name, email address, and date of birth. This information stores in the “Users” table.

Facebook> 

SELECT * FROM Users;

This query would return all of the columns in the Users table.

CASE STUDY 2: Twitter 

Twitter is a social networking and microblogging service that allows users to send and read short 140-character messages called “tweets”. Twitter uses a relational database to store all of its data, including information on users, their tweets, and the people they follow. 

When you sign up for Twitter, you provide your name, email address, and username. This information is stored in the “Users” table.

twitter> 

SELECT * FROM Users;

This query would return all of the columns in the Users

Your profile information such as your gender, location, and website is stored in the “Profile” table.

twitter> 

SELECT * FROM Profile;

This query would return all of the columns in the Profile table.

The tweets you post on Twitter stores in the “Tweets” table.

twitter> 

SELECT * FROM Tweets;

This query would return all of the columns in the Tweets table.

The people you follow on Twitter stores in the “Followers” table.

twitter> 

SELECT * FROM Followers;

This query would return all of the columns in the Followers table.

CASE STUDY 3: Instagram 

Instagram is a photo-sharing and social networking service that allows users to share photos and videos. Instagram uses a relational database to store all of its data, including information on users, their photos, and the people they follow. 

When you sign up for Instagram, you provide your name, email address, and username. This information is stored in the “Users” table.

Your profile information such as your website and biography is stored in the “Profile” table.

The photos you post on Instagram are stored in the “Photos” table.

The people you follow on Instagram are stored in the “Followers” table.

CASE STUDY 4: Airbnb 

Airbnb is an online marketplace that connects people who need a place to stay with people who need to rent out their extra space. Airbnb uses a relational database to store all of its data, including information on users, their listings, and their reservations. 

When you sign up for Airbnb, you provide your name, email address, and date of birth. This information stores in the “Users” table.

Your profile information such as your photo, about me, and also verification status stores in the “Profile” table.

The listings you create on Airbnb are stored in the “Listings” table.

The reservations you make on Airbnb are stored in the “Reservations” table.

CASE STUDY 5: Yelp

Yelp is a local business directory and review site. Yelp uses a relational database to store all of its data, including information on businesses, their reviews, and the users who write them. 

When you sign up for Yelp, you provide your name, email address, and also password. This information stores in the “Users” table.

Your profile information such as your photo and the number of reviews that you are writing stores in the “Profile” table.

The businesses you review on Yelp stores are in the “Businesses” table.

The reviews you write on Yelp stores are in the “Reviews” table.

CASE STUDY 6: Pinterest 

Pinterest is a social networking and also content-sharing service that allows users to share photos and videos. Pinterest uses a relational database to store all of its data, including information on users, their pins, and the people they follow. 

When you sign up for Pinterest, you provide your name, email address, and also username. This information stores in the “Users” table.

Conclusion: 

Twitter, Instagram, Airbnb, Yelp, and also Pinterest all use relational databases to store their data. This data includes information on users, their posts or reviews, and the people they follow.

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