====== Formater la date et l'heure vers une chaîne ======

Formater la date et l'heure courante sous forme de chaîne
au format **AAAAMMJJHHMMSS** :

<code sql>
select
  extract(year from current_timestamp) ||
  substring(100+extract(month from current_timestamp) from 2 for 2) ||
  substring(100+extract(day from current_timestamp) from 2 for 2) ||
  substring(100+extract(hour from current_timestamp) from 2 for 2) ||
  substring(100+extract(minute from current_timestamp) from 2 for 2) ||
  substring(100+extract(second from current_timestamp) from 2 for 2)
from rdb$database;
</code>