Leetcode - 1661 Average Time of Process per Machine (MySQL) | Leetcode Sql-50 | Day -10

📌 Learn how to calculate the average processing time in SQL using JOIN, AVG, and ROUND! In this video, I'll break down the query step by step, explaining:
✅ How to join the same table to pair start and end times
✅ How to calculate processing time for each machine
✅ How to use AVG() to get the average processing time
✅ How to format results using ROUND()

🔍 Table Used: Activity Table (with machine_id, process_id, activity_type, timestamp)
💡 Ideal for: Beginners & intermediate SQL learners

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