Q&A about the site for people using the vi and Vim families of text editors
SELECT AVG(CAST(DATEDIFF(SECOND, p.CreationDate, a.CreationDate) AS BIGINT)) AS avg_secs FROM Posts p INNER JOIN Posts a ON a.id = p.AcceptedAnswerId WHERE p.AcceptedAnswerId IS NOT NULL AND datepart(year, p.CreationDate) = 2017