text: 
  select distinct account.display_name
  from
  tag t1, site s1, question q1, tag_question tq1, so_user u1,
  tag t2, site s2, question q2, tag_question tq2, so_user u2,
  account
  where
  -- group theory askers
  s1.site_name='stackoverflow' and
  t1.name  = 'uwp' and
  t1.site_id = s1.site_id and
  q1.site_id = s1.site_id and
  tq1.site_id = s1.site_id and
  tq1.question_id = q1.id and
  tq1.tag_id = t1.id and
  q1.owner_user_id = u1.id and
  q1.site_id = u1.site_id and
  
  -- D&D askers
  s2.site_name='superuser' and
  t2.name  = 'windows' and
  t2.site_id = s2.site_id and
  q2.site_id = s2.site_id and
  tq2.site_id = s2.site_id and
  tq2.question_id = q2.id and
  tq2.tag_id = t2.id and
  q2.owner_user_id = u2.id and
  q2.site_id = u2.site_id and
  
  -- intersect
  u1.account_id = u2.account_id and
  account.id = u1.account_id;
  
  