Q&A for users of Iota, the open-source cryptocurrency for IoT that does not use a blockchain
-- https://www.mssqltips.com/sqlservertip/1145/date-and-time-conversions-using-sql-server/ -- https://www.mssqltips.com/sqlservertip/2655/format-sql-server-dates-with-format-function/ -- '%Y %M %D %H:%i:%s' -- from_unixtime(d.CreationDate, '%Y %M') as [M] -- DATE_FORMAT(d.CreationDate, '%d/%m/%Y') as M, -- convert(varchar(10), d.CreationDate, 101) as [date1], SELECT date1, count(id) as cnt FROM ( SELECT FORMAT (d.CreationDate, 'yy-MM') as [date1], (d.Id) as id FROM Posts d -- d=duplicate LEFT JOIN PostHistory ph ON ph.PostId = d.Id LEFT JOIN PostLinks pl ON pl.PostId = d.Id LEFT JOIN Posts o ON o.Id = pl.RelatedPostId -- o=original WHERE d.PostTypeId = 1 -- 1=Question AND pl.LinkTypeId = 3 -- 3=duplicate AND ph.PostHistoryTypeId = 10 -- 10=Post Closed ) as t1 group by date1 order by date1