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Editorial Team
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Asked: 2026-05-26T10:49:12+00:00

INSERT INTO users (firstname, lastname, email, mobile) VALUES (‘Karem’, ‘Parem’, ‘mail@mail.com’, ‘123456789’); This what

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INSERT INTO users (firstname, lastname, email, mobile) VALUES ('Karem', 'Parem', 'mail@mail.com', '123456789');

This what i would like to do, but if a row with the same email mail@mail.com already exists, then it should update that row with these values.

I found the http://dev.mysql.com/doc/refman/5.0/en/insert-on-duplicate.html but I dont understand it

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1 Answer

  1. Editorial Team

    Use ALTER TABLE to add a unique constraint on the email column then try this query:

    INSERT INTO users(firstname, lastname, email, mobile)
VALUES ('Karem', 'Parem', 'mail@mail.com', '123456789')
ON DUPLICATE KEY UPDATE
    firstname = 'Karem',
    lastname = 'Parem',
    email = 'mail@mail.com', -- you can probably omit this
    mobile = '123456789'

    Be careful though – if you have any other unique keys defined on your table (including the primary key, which is by definition unique) then they can also trigger the update.

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