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Bonjour Stéphane,

Ceci pourrait marcher:

select id,
       date_absence,
       (select count(id)
        from presences as innerPresences
        where presences.id = innerPresences.id) as quantite
from presences;

Il s'agit d'une sous-requêtes corrélées: https://sqlpro.developpez.com/cours/sqlaz/sousrequetes/#L2

Bien à toi.

Le 20.10.2020 00:37, Stéphane Santon a écrit :
Bonjour,

Je cherche à créer une requête SQL sous Base qui me rajoute un champ
"calculé", le calcul étant le nombre d'enregistrements qui ont un
champ à la même valeur.

Depuis :

| id    | date_absence|
| Larry | 05/09/2020  |
| Sarah | 07/09/2020  |
| Sarah | 12/09/2020  |
| Sarah | 18/09/2020  |
| Sarah | 01/10/2020  |
| Anna  | 25/09/2020  |
| Anna  | 27/09/2020  |
| Anna  | 05/10/2020  |
| Henri | 21/09/2020  |
| Henri | 25/09/2020  |

Je veux sortir ça :

| id    | date_absence| Qté |
| Larry | 05/09/2020  | 1   |
| Sarah | 07/09/2020  | 4   |
| Sarah | 12/09/2020  | 4   |
| Sarah | 18/09/2020  | 4   |
| Sarah | 01/10/2020  | 4   |
| Anna  | 25/09/2020  | 3   |
| Anna  | 27/09/2020  | 3   |
| Anna  | 05/10/2020  | 3   |
| Henri | 14/09/2020  | 2   |
| Henri | 25/09/2020  | 2   |

Un truc du style

SELECT
        "Feuille1"."id" AS id_ref,
        "date_absence",
        (SELECT COUNT(*) FROM "Feuille1" WHERE "id" == "id_ref")
FROM "Feuille1"

Merci

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