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with pt as (
      select pt.tagid, pt.postid, t.tagname
      from posttags pt join
           tags t
           on pt.tagid = t.id
     )
select pt.tagname, pt2.tagname, count(*)
from pt join
     pt pt2
     on pt.postid = pt2.postid and
        pt.tagname < pt2.tagname
group by pt.tagname, pt2.tagname
order by count(*) desc;

fork query

edited nov 29 anonymous

created may 2 Amir.Heshmati