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find the average processing time by machine for all processes
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-- Write your PostgreSQL query statement below | |
/* | |
Lets first do a table scan to get every process_id's time delta | |
*/ | |
with process_time_delta as ( | |
Select | |
machine_id, | |
process_id, | |
activity_type, | |
timestamp, | |
LAG(timestamp, 1) OVER ( | |
Partition by machine_id, process_id | |
ORDER by timestamp asc | |
) as start_timestamp | |
From Activity | |
) | |
select | |
a.machine_id, | |
round(avg(a.timestamp - p.start_timestamp)::numeric, 3) as processing_time | |
from Activity a | |
inner join process_time_delta p | |
on p.machine_id = a.machine_id | |
and p.process_id = a.process_id | |
where a.activity_type = 'end' /* only need the end activity timestamp */ | |
group by 1 |
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