Revenue analytics and unit economics Joining tables without conditions with CROSS JOIN

101. Joining tables without conditions with CROSS JOIN

When calculating total revenues or ROI per campaign we joined some tables first and then applied grouping and counting or grouping and summing to the joined table.

Sometimes we aren’t that lucky and we have results of aggregations in different tables. How to join them if there’s no foreign key or mutual column (like we had with utm_campaign)?

Percentage of customers

Imagine we’d have two different tables – one would contain number of users, the other one number of customers. We can emulate this scenario using CTEs:

WITH users_count AS ( SELECT...
“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... ⏳
Previous exercise: Calculating marketing channel ROI
Next exercise: Calculating overall performance marketing ROI