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Use this query to find where users have their post migrated but they never followed the question to the target site.

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SELECT
    OwnerDisplayName
  , Posts.Id AS [Post Link]
  , PostHistory.CreationDate AS [Migration Date]
  , Posts.CreationDate AS [Original Post Date]
  , CASE  
    WHEN  SUBSTRING(
              PostHistory.Comment
            , 13
            , CHARINDEX(
                  '.'
                , SUBSTRING(
                      PostHistory.Comment
                    , 13
                    , LEN(PostHistory.Comment)
                  )
              ) -1
          ) = 'meta'
    THEN  SUBSTRING(
              PostHistory.Comment
            , 13
            , CHARINDEX(
                  '.'
                , SUBSTRING(
                      PostHistory.Comment
                    , 1
                    , LEN(PostHistory.Comment)
                  )
              ) - 1
          )
          
    ELSE  SUBSTRING(
              PostHistory.Comment
            , 13
            , CHARINDEX(
                  '.'
                , SUBSTRING(
                      PostHistory.Comment
                    , 13
                    , LEN(PostHistory.Comment)
                  )
              ) -1
          ) 
    END AS [Source Site]
FROM
  Posts
JOIN
  PostHistory ON Posts.Id = PostHistory.PostId
WHERE
  PostHistory.PostHistoryTypeId = 36 AND
  Posts.PostTypeId = 1 AND
  OwnerUserId IS NULL 
ORDER BY 5 ASC, OwnerDisplayName ASC, Posts.CreationDate DESC

view current version

edited may 24 12 drachenstern

created may 24 12 Tim Stone