Create 1661-average-time-of-process-per-machine.sql

Author: everthis

1661-average-time-of-process-per-machine.sql

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+# Write your MySQL query statement below
+SELECT s.machine_id, ROUND(AVG(e.timestamp-s.timestamp), 3) AS processing_time
+FROM Activity s JOIN Activity e ON
+    s.machine_id = e.machine_id AND s.process_id = e.process_id AND
+    s.activity_type = 'start' AND e.activity_type = 'end'
+GROUP BY s.machine_id;