select AVG(cast(Diff as BIGINT)) from (select DateDiff(se...


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Signal Processing

Q&A for practitioners of the art and science of signal, image and video processing

select AVG(cast(Diff as BIGINT)) 
(select DateDiff(second, P.CreationDate, C.CreationDate) as Diff
from Posts as P join Comments as C
on C.PostId = P.Id
where year(P.CreationDate) = 2017 and P.PostTypeId = 1) as a

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