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Q&A about the site for expert genealogists and people interested in genealogy or family history

select count(q.OwnerUserId)
  from (
    (select Posts.*
      from (Posts join PostTypes on Posts.PostTypeId = PostTypes.Id)
      where PostTypes.Name = 'Question') as q
    join
    (select Posts.*
      from (Posts join PostTypes on Posts.PostTypeId = PostTypes.Id)
      where PostTypes.Name = 'Answer') as a
      on q.Id = a.ParentId)
  where q.OwnerUserId = a.OwnerUserId;

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created apr 18 Oddthinking