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Average Time of Process per Machine

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	`1`	`+Link: https://leetcode.com/problems/average-time-of-process-per-machine/`
	`2`	`+Tool: MS SQL Server`
	`3`	`+`
	`4`	`+`
	`5`	`+`
	`6`	`+`
	`7`	`+`
	`8`	`+`
	`9`	`+select a.machine_id, round(avg(a2.timestamp - a.timestamp),3) as processing_time`
	`10`	`+from Activity a, Activity a2`
	`11`	`+where a.process_id = a2.process_id and a.machine_id = a2.machine_id`
	`12`	`+and a.activity_type = 'start' and a2.activity_type = 'end'`
	`13`	`+group by a.machine_id`

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