instruction: Find Questions Migrated Without the User. Use this query to find where users have their post migrated but they never followed the question to the target site.
response: SELECT OwnerDisplayName, Posts.Id AS "post_link", PostHistory.CreationDate AS "migration_date", Posts.CreationDate AS "original_post_date", SUBSTRING(PostHistory.Comment, 13, STR_POSITION(SUBSTRING(PostHistory.Comment, 13, LENGTH(PostHistory.Comment)), '.') - 1) 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, OwnerDisplayName, Posts.CreationDate DESC