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QCM sur les sous-requêtes SQL

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QCM sur les sous-requêtes SQL

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Tests sur les sous-requêtes

Created by

Lemba
Lemba
France

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QCM sur les sous-requêtes SQL
 

QCM sur les sous-requêtes SQLOnline version

Tests sur les sous-requêtes

by Lemba
1

Qu'est‑ce qu'une sous‑requête en SQL ?

2

Dans quelles clauses peut-on placer une sous‑requête ?

3

Quel est l’objectif principal d’une sous‑requête en SELECT ?

4

Qu’est‑ce qu’une sous‑requête corrélée ?

5

À quoi sert une sous‑requête dans HAVING ?

Retour

Elle s'exécute généralement en premier pour fournir son résultat à la requête principale.

Les sous-requêtes peuvent apparaître dans WHERE, FROM, HAVING ou SELECT.

Exemple donné : calculer des valeurs dérivées comme moyenne ou counts.

La sous‑requête corrélée se réfère à des colonnes de la requête principale.

HAVING est utilisé pour filtrer les groupes, souvent via une sous‑requête pour des valeurs dérivées.

 
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