SQL Time Calculations | LeetCode 1661: Average Time of Process per Machine | TextroVert

Calculating durations between timestamps is a core data engineering task. Today on TextroVert, we solve LeetCode 1661. We’ll show you how to pair 'start' and 'end' events using a self-join to calculate the processing time for each machine. Key Takeaways: • Pairing rows from the same table with Self-Joins. • Filtering by activity type (start vs. end). • Using ROUND() and AVG() to get the final machine-level metrics.