80. Identifying power referral users

When running a referral program, it’s important to understandwho already shares your app, who are those power users? Because who knows, maybe there’re more 🚀

In this exercise let’s find out a user ID of the most powerful referral user (the user who invited the highest amount of users).

referrer_id column inside users table contains a value of another user ID (ID of a user whose referral link was used). That user ID (inside referrer_id column) is exactly the user ID we need to solve the exercise.

“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 and exercises (you’re looking at one atm). 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 in your query here. You might want to start by listing all records: SELECT * FROM users
LIMIT 500
Loading chart... ⏳