Multi-Account-User

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Science Fiction and Fantasy Meta

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SELECT 
    u1.EmailHash,
    Count(u1.Id) AS Accounts,
    (SELECT Cast(u2.Id AS varchar) + ' (' + u2.DisplayName + '), ' FROM Users u2 WHERE u2.EmailHash = u1.EmailHash FOR XML PATH ('')) AS IdsAndNames
FROM
    Users u1
WHERE
    u1.EmailHash IS NOT NULL  
    AND EXISTS (
       SELECT NULL FROM Users u2
       WHERE u2.EmailHash=u1.EmailHash
       AND u2.Id=##UserID:int##
    )
GROUP BY
    u1.EmailHash
HAVING
    Count(u1.Id) > 1
ORDER BY 
    Accounts DESC

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