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select count(1) as CSS_JAVA_Commented_post_count
from posts pst
where pst.id in (select pstg.postId
               from posttags pstg 
               join tags tg on tg.id=pstg.TagID
               where upper(tg.tagName)='CSS'
               OR upper(tg.tagName)='JAVA')
and exists (select 1 from comments cmt where cmt.postID=pst.id)

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edited oct 6 22

created oct 4 22 anonymous