In this video, we solve LeetCode 512: Game Play Analysis II using a clear and beginner-friendly SQL approach.
🔍 Problem Goal:
Find the device ID each player used during their first login (i.e., the earliest event_date for each player_id) from the Activity table.
📊 Table Schema:
player_id (int)
device_id (int)
event_date (date)
games_played (int)
🧠 Key Concepts Covered:
Grouping data with GROUP BY
Finding minimum values with MIN()
Joining subqueries to get additional columns (like device_id)
Writing clean and efficient SQL for real-world scenarios
✅ Example Output:
For each player_id, we return the device_id used on their first login date.
📈 Whether you're prepping for interviews or improving your SQL skills, this walkthrough will help you learn how to break down and solve SQL challenges effectively.
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