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Q&A for project managers

SELECT
  YEAR(p.CreationDate) AS yr,
  COUNT(DISTINCT p.OwnerUserId) AS uq_owner_count,
  COUNT(DISTINCT c.UserId) AS uq_commenter_count
FROM
  Posts p
  LEFT JOIN
  Comments c
    ON p.Id=c.PostId
WHERE
  p.CreationDate > '2015-01-01'
  AND p.tags like '%sql%'
GROUP BY
  YEAR(p.CreationDate)
ORDER BY
  yr DESC

fork query

edited may 11

created may 11 anonymous