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Select count(*) FROM Posts p WHERE p.id in (
select pt.PostId from PostTags pt
inner join Posts p on pt.PostId = p.Id
inner join Tags t on pt.TagId = t.Id
where p.Id in (SELECT pt.PostId from PostTags pt WHERE pt.TagId=1386)
AND p.Id in (SELECT pt.PostId from PostTags pt WHERE pt.TagId=17)
GROUP BY p.title, pt.PostId) AND p.creationdate between '2021/01/01' and '2022/01/01'