instruction: Askers by month for tag.
response: SELECT mo, Askers FROM (SELECT DATEADD(month, DATEDIFF(month, 0, CreationDate), 0) AS mo, COUNT(DISTINCT OwnerUserId) AS Askers FROM Posts AS q JOIN PostTags AS pt ON pt.PostId = q.Id JOIN Tags AS t ON t.Id = pt.TagId WHERE q.PostTypeId = 1 AND t.TagName = '##tagname##' AND q.CreationDate < DATEADD(month, DATEDIFF(month, 0, GETDATE()), 0) GROUP BY DATEADD(month, DATEDIFF(month, 0, CreationDate), 0)) AS x ORDER BY mo