SQL Interview Question Active User Retention Facebook Data Lemur Hard Problem 1 | Tech Town

Welcome to our channel! In this video, we tackle a challenging SQL interview question from Facebook, focused on active user retention. This problem is known for its complexity and is often featured in top tech company interviews. We'll break down the question step-by-step, providing a clear explanation and solution using SQL.

Whether you're preparing for a tech interview, brushing up on your SQL skills, or just love solving data problems, this video is perfect for you. Join us as we explore advanced SQL techniques and best practices to solve real-world data challenges.

In this video, you'll learn:

How to approach complex SQL interview questions
Techniques for analyzing user retention data
Best practices for writing efficient SQL queries
Tips for preparing for SQL interviews at top tech companies
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-- Create the table with the new column
CREATE TABLE user_actions (
user_id INT,
event_id INT,
event_type VARCHAR(50),
event_date DATETIME,
session_id INT
);

-- Insert the new data
INSERT INTO user_actions (user_id, event_id, event_type, event_date, session_id)
VALUES
(445, 7765, 'sign-in', '2022-05-31 12:00:00', 7),
(445, 3634, 'like', '2022-06-05 12:00:00', 7),
(648, 3124, 'like', '2022-06-18 12:00:00', 7),
(648, 2725, 'sign-in', '2022-06-22 12:00:00', 7),
(648, 8568, 'comment', '2022-07-03 12:00:00', 7),
(445, 4363, 'sign-in', '2022-07-05 12:00:00', 7),
(445, 2425, 'like', '2022-07-06 12:00:00', 7),
(445, 2484, 'like', '2022-07-22 12:00:00', 7),
(648, 1423, 'sign-in', '2022-07-26 12:00:00', 7),
(445, 5235, 'comment', '2022-07-29 12:00:00', 7),
(742, 6458, 'sign-in', '2022-07-03 12:00:00', 7),
(742, 1374, 'comment', '2022-07-19 12:00:00', 7);
Hashtags:
#SQL #FacebookInterview #DataLemur #UserRetention #SQLTutorial #TechInterview #DataScience #DataEngineering

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