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@jatorre jatorre/gist:7336704

Last active Dec 27, 2015
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WITH summary_groups as(
WITH summary as (
select (row_number() over (order by time asc nulls last)+1)/2 as rownum,time
from sensor_log_2013_10_27_12_01
order by time asc)
max(time) OVER(PARTITION BY rownum) -
min(time) OVER(PARTITION BY rownum) diff
FROM summary)
avg(diff) as diffavg,
(SELECT max(time)-min(time) as total_diff FROM sensor_log_2013_10_27_12_01 as subq)/avg(diff) as num_steps
FROM summary_groups
WHERE diff>0
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