SELECT evenement.libelle as evenement,
    instruction.lettretype,
    to_char(date_evenement,'DD/MM/YYYY') as datecourrier
    from &DB_PREFIXEinstruction
    inner join &DB_PREFIXEevenement on evenement.evenement = instruction.evenement
    where dossier = '&idx'
    order by date_evenement asc