We also show the creation date of the posts.
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-- Find identical titles
-- We also show the creation date of the posts.
SELECT a.Id AS [Post Link], a.CreationDate AS "First Date",
b.Id AS [Post Link], b.CreationDate AS "Second Date"
FROM Posts AS a JOIN Posts AS b ON a.Title = b.Title
WHERE a.Id < b.Id
and a.ClosedDate IS NULL
and b.ClosedDate IS NULL;