Number of users with at least one post (monthly)

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SELECT eomonth(p.CreationDate) [month],
  COUNT(DISTINCT p.OwnerUserId) AS [Users],
  COUNT(DISTINCT p.OwnerDisplayName) AS [Deleted Users],
  CAST(COUNT(DISTINCT p.OwnerUserId)+COUNT(DISTINCT p.OwnerDisplayName) AS Integer) AS [Total Users]
FROM Posts p
WHERE p.CreationDate >= '##Date1?2015-01-01##' AND p.CreationDate <= '##Date2?2021-01-01##'
GROUP BY eomonth(p.CreationDate)
ORDER BY eomonth(p.CreationDate)

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