Number of users with at least on comment (monthly)

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

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