51. Listing distinct book categories with DISTINCT

The local book store partnership seemed like a very great idea – use a selection of book categories to reach out to a certain audience.

Let’s explore which categories (genres) do we have in Bindle’s library. Maybe we can spot some new bundles and could come up with more partnerships.

Our current SQL toolbox allows us to select genre for each book:

SELECT genre FROM books 

As you can see there’re a lot of repetitive genres. What we want is a list of unique or distinct genres:

SELECT DISTINCT genre FROM books ORDER BY genre 

To select only unique...

“well worth the money”
Sign up and check out 36 free lessons and exercises.

Anatoli Makarevich, author of SQL Habit About SQL Habit

Hi, it’s Anatoli, the author of SQL Habit. 👋

SQL Habit is a course (or, as some of the students say, “business simulator”). It’s based on a story of a fictional startup called Bindle. You’ll play a role of their Data Analyst 📊 and solve real-life challenges from Business, Marketing, and Product Management.

SQL Habit course is made of bite-sized lessons (you’re looking at one atm) and exercises. They always have a real-life setting and detailed explanations. You can immediately apply everything you’ve learned at work. 🚀

“well worth the money”

Fluent in SQL in a month

Master Data Analysis with SQL with real life examples from Product Management, Marketing, Finance and more.
-- Type your query here, for example this one -- lists all records from users table: SELECT * FROM users
LIMIT 500
Loading chart... ⏳