Q&A about the site for expert genealogists and people interested in genealogy or family history
SELECT Year(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?2000-01-01##' AND c.CreationDate <= '##Date2?3000-01-01##' GROUP BY Year(c.CreationDate) ORDER BY Year(c.CreationDate)