Q&A for researchers, developers, students, teachers, and end users interested in bioinformatics
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 ) as t1 group by date1 order by date1