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Asked: 2026-06-05T08:42:06+00:00

I done in that way: SELECT * FROM ( SELECT DISTINCT (u2.email) email FROM

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I done in that way:

SELECT * FROM ( 
               SELECT DISTINCT (u2.email) email FROM  `users` u1 LEFT JOIN 
                       users u2 ON  u1.email = u2.email AND u1.id <> u2.id
               )users  WHERE email IS NOT NULL

Is there a contract formula?

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1 Answer

  1. Editorial Team

    Use an INNER JOIN if you don’t want NULL results.

    SELECT DISTINCT(u2.email) FROM users u1 
    INNER JOIN users u2 ON u1.email = u2.email AND u1.id <> u2.id

    If you must use a LEFT JOIN:

    SELECT DISTINCT(u2.email) FROM users u1 
    LEFT JOIN users u2 ON u1.email = u2.email AND u1.id <> u2.id 
    WHERE u2.email IS NOT NULL
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