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Editorial Team
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Asked: 2026-05-19T12:36:26+00:00

I have 3 tables MySQL (MyIsam): user (id), message (id, userId, …), archivedMessage (id,

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I have 3 tables MySQL (MyIsam):

user (id), message (id, userId, ...), archivedMessage (id, userId, ...)

How can I delete all the users having no message AND no archivedMessage?

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1 Answer

  1. Editorial Team

    You could use not exists:

    delete from user
where not exists (select * from message m where m.userid = user.id)
      and not exists (select * from archivedMessage am where am.userid = user.id)
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