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A list of users that have duplicate accounts on site, based on the EmailHash and lots of reputation is riding on it

Q&A for software developers, mathematicians and others interested in cryptography

-- Users with more than one duplicate account and a more that 1000 reputation in aggregate
-- A list of users that have duplicate accounts on site, based on the EmailHash and lots of reputation is riding on it

SELECT 
    u1.EmailHash,
    Count(u1.Id) AS Accounts,
    (
        SELECT Cast(u2.Id AS varchar) + ' (' + u2.DisplayName + ' ' + Cast(u2.reputation as varchar) + '), ' 
        FROM Users u2 
        WHERE u2.EmailHash = u1.EmailHash order by u2.Reputation desc FOR XML PATH ('')) AS IdsAndNames
FROM
    Users u1
WHERE
    u1.EmailHash IS NOT NULL
    and (select sum(u3.Reputation) from Users u3 where u3.EmailHash = u1.EmailHash) > 1000  
    and (select count(*) from Users u3 where u3.EmailHash = u1.EmailHash and Reputation > 10) > 1
GROUP BY
    u1.EmailHash
HAVING
    Count(u1.Id) > 1
ORDER BY 
    Accounts DESC

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created may 25 10 sam.saffron