DELETE FROM wp_usermeta WHERE user_id NOT IN(SELECT ID FROM wp_users WHERE user_login IN ('admin','second_user_to_keep','etc'))
DELETE FROM wp_usermeta WHERE user_id NOT IN(SELECT ID FROM wp_users WHERE user_login IN ('admin','second_user_to_keep','etc'))
Yes this is very easy way to delete a user. Everyone must be known to delete user by command instead delete by using database.
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