SELECT Posts.Id AS [Post Link] FROM Posts JOIN ( SELECT P...

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SELECT
  Posts.Id AS [Post Link]
FROM
  Posts
JOIN
  (
    SELECT
      PostId,
      CASE WHEN p.PostHistoryTypeId = 19 THEN 1 ELSE 0 END AS IsProtected
    FROM
      PostHistory p
    JOIN
      (
        SELECT
          MAX(Id) Id
        FROM
          PostHistory 
        WHERE
          PostHistoryTypeId IN(19, 20)
        GROUP BY PostId
      ) m ON p.Id = m.Id
  ) History ON Posts.Id = History.PostId
WHERE
  History.IsProtected = 1
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