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The PostHistoryTypes according to the Data Explorer are given here. However, certain HistoryTypeIds are never present while querying the Data Explorer. The most notable missing id for my personal data task is 17 - Post Migrated. I don't see them present either on Stack Overflow or Super User. Is there any particular reason for this?

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    Probably because Data.SE doesn't track across multiple sites, for that specific ID.
    – Richard J. Ross III
    Jul 23, 2013 at 16:03
  • @RichardJ.RossIII I am sorry - does this mean that the PostHistoryTypeId = 17 is of no value? I want to get all questions on Stack Overflow which are migrated to other platforms. What is the best way to get this data?
    – Dexter
    Jul 23, 2013 at 17:31

1 Answer 1

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This is now possible by using PostHistoryType 'Migrated away' as described in the Database schema post.

select ph.PostId as [Post Link]
     , ph.CreationDate
     , ph.UserId as [User Link]
     , ph.UserDisplayName
     , ph.Comment as target
from posthistory ph
inner join posts p on p.id = ph.postid
where posthistorytypeid = 35 -- Migrated away
and p.posttypeid = 1 -- question
order by CreationDate

At time of posting this query returns 691 rows.

I'm not sure if the 'whitelist' mentioned in this only applies to a certain posthistorytypeid or also on specific posts within a certain type.

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