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Q&A for scientific skepticism

SELECT 
        p.OwnerUserId,
        pt.TagId,
        MIN(p.CreationDate) AS FirstTagUsageDate
    FROM posts p
    JOIN PostTags pt ON p.Id = pt.PostId
    WHERE p.PostTypeId = 1
    GROUP BY p.OwnerUserId, pt.TagId

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edited sep 8

created sep 8 jon.doe45585