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select count(1)
from (
select pt1.postid
from posttags pt1
  JOIN 
    tags t1 ON pt1.tagid = t1.id 
where t1.Tagname in ('javascript','jquery')
group by pt1.postid
having count(distinct pt1.tagid) > 1
) s

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edited dec 4

created dec 4 Janis123