Let’s open the chapter about Product Analytics for mobile apps with the analysis of the previous exercise. The goal of the exercise was to estimate the release date of a certain mobile app version.
Such a question “When something appeared for the first time or started to happen?” is very common for many business processes:
- launch of marketing campaigns
- product releases
- bugs (the notion of when the bug was introduced could help to identify the root cause)
- etc
Usually, we have some sort of dataset with events and their timestamps. Our question “...
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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. 