SELECT 'mail' type, mail_id, user_id, folder_id, m_subject, m_message, rcp_to, rcp_cc, rcp_bcc, (CASE WHEN user_id = 13 THEN 'ilias' ELSE login END) login FROM mail LEFT JOIN usr_data on sender_id = usr_id WHERE user_id IN (?); SELECT path FROM mail_attachment WHERE mail_id IN (?);