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📌 Topic: Why Most Analysts Calculate Retention Wrong in SQL

Retention is not just COUNT(DISTINCT user_id).
It’s a cohort-based analysis over time.

Most retention mistakes don’t come from SQL syntax —
they come from incorrect analytical logic.

In this video, you’ll learn:

Why many analysts calculate retention incorrectly

How to properly define cohorts based on signup date

How to measure user activity week by week

How to build a correct cohort retention table in SQL

Who is this for?

Junior, Middle, and Senior data analysts

Product analysts

Business analysts

Anyone who wants to improve analytical thinking in SQL

📂 Dataset & SQL repository:

https://github.com/NMildred/practical-sql/

Key takeaway:

Retention is about users returning relative to the moment they entered the product — not just the number of unique users who performed an event.

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