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Modello E-R di un data base

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Q 1/4
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In the ER model of a database, what is an entity?
29
A programming language used to query the database.
A person, place, object, or event in the real world that is represented in the database.
A data structure used to organize information in the database.
A type of database management system.

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4 questions

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Q1
In the ER model of a database, what is an entity?
A programming language used to query the database.
A person, place, object, or event in the real world that is represented in the database.
A data structure used to organize information in the database.
A type of database management system.
30s
Q2
L'attributo è
una relazione
un record
un'istanza
un elemento dell'entità
30s
Q3
La relazione è
associazione fra due entità
un'entità
un attributo
un attributo multivalore
30s
Q4
l'attributo chiave
nullo
univoco
facoltativo
30s

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