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SELECT year_month, count(*) as posts_count from ( select format(p.creationdate, 'yy-MM') as year_month from posts as p join posttags as pt on p.id = pt.postid join tags as t on pt.tagid = t.id where t.tagname = 'debezium' and p.creationdate > '2015' ) temp group by year_month order by year_month