12.2.4 - GROUP BY – Aggregate Results
Enroll to start learning
You’ve not yet enrolled in this course. Please enroll for free to listen to audio lessons, classroom podcasts and take practice test.
Practice Questions
Test your understanding with targeted questions
What does the GROUP BY clause do?
💡 Hint: Think of how you can summarize data.
Write a SQL query to count the number of users registered by email domain.
💡 Hint: Look into substring functions for extracting data.
4 more questions available
Interactive Quizzes
Quick quizzes to reinforce your learning
What does the GROUP BY clause do in SQL?
💡 Hint: Think about how we summarize information.
True or False: GROUP BY can be used with aggregate functions like COUNT and AVG.
💡 Hint: Recall our discussion on how to summarize data.
1 more question available
Challenge Problems
Push your limits with advanced challenges
Write a SQL query to find the total revenue generated per product category for the last year.
💡 Hint: Make sure your date filters include the correct time frame.
Create a report that shows how many times each user logged in within the last month, grouped by user.
💡 Hint: Filter the relevant records before counting.
Get performance evaluation
Reference links
Supplementary resources to enhance your learning experience.