Proiectarea Bazelor De Date
Date. Informatii.Cunostinte Entitati. Instante. Atribute. UID Relatii intre entitati Rezolvarea relatiilor many-to-many
- 1.
O entitate este de obicei :
- A.
Un verb
- B.
Substantiv
- C.
Un adverb
- D.
Orice cuvant
Correct Answer
B. SubstantivExplanation
An entity is typically a noun. Nouns are words that represent a person, place, thing, or idea. In this context, an entity refers to something that exists or can be identified. Verbs, adverbs, and any other word types do not typically represent entities in the same way that nouns do. Therefore, the correct answer is substantiv.Rate this question:
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- 2.
Care dintre urmatoarele variante nu poate reprezenta un atribut al entitatii ELEV :
- A.
Nume
- B.
Adresa
- C.
Consum
- D.
Prenume
Correct Answer
C. ConsumExplanation
The attribute "consum" cannot represent an attribute of the entity "ELEV" because "consum" does not seem to be a characteristic or property that is typically associated with a student. Attributes like "nume" (name), "adresa" (address), and "prenume" (first name) are more commonly associated with a student entity. However, "consum" does not provide any relevant information about a student and does not fit the context of the entity "ELEV".Rate this question:
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- 3.
Ce semnificatie are "piciorul de cioara" in cadrul unui ERD?
- A.
Relatia este obligatorie
- B.
Relatia este optionala
- C.
Pot exista una sau mai multe instante ale entitatii langa care apare semnul in relatie cu o instanta a celeilalte entitati
- D.
Niciuna din variantele anterioare
Correct Answer
C. Pot exista una sau mai multe instante ale entitatii langa care apare semnul in relatie cu o instanta a celeilalte entitatiExplanation
The "piciorul de cioara" symbol in an ERD indicates that there can be one or more instances of an entity next to which the symbol appears in relation to an instance of the other entity. This means that the relationship between the entities is one-to-many, where one instance of the first entity can be associated with multiple instances of the second entity.Rate this question:
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- 4.
Care dintre urmatoarele fraze poate fi citita din schema alaturata:
- A.
Un student poate sa urmeze mai multe cursuri
- B.
Un curs poate fi urmat de mai multi studenti.
- C.
Un student trebuie sa urmeze un singur curs.
- D.
Un curs trebuie sa fie urmat de un student.
Correct Answer
B. Un curs poate fi urmat de mai multi studenti.Explanation
The given answer, "Un curs poate fi urmat de mai multi studenti," can be inferred from the diagram because it states that a course can be taken by multiple students. This is supported by the arrows connecting the "Curs" node to multiple "Student" nodes in the diagram.Rate this question:
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- 5.
Cum se citeste corect relatia dintre CLIENT si MASINA?
- A.
Fiecare CLIENT poate sa inchirieze o MASINA si numai una.
- B.
Fiecare CLIENT trebuie sa inchirieze o MASINA si numai una.
- C.
Fiecare CLIENT poate sa inchirieze una sau mai multe MASINI.
- D.
Fiecare CLIENT trebuie sa inchirieze una sau mai multe MASINI.
Correct Answer
C. Fiecare CLIENT poate sa inchirieze una sau mai multe MASINI.Explanation
Each CLIENT can rent one or more CARS.Rate this question:
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- 6.
Atributul este: (alegeti variantele corecte)
- A.
Este o proprietate a unei entitati sau un detaliu referitor la acesta.
- B.
Descrie, cuantifica, califica, clasifica sau specifica o entitate
- C.
Are un tip care poate fi un numar, un sir de caractere, o data calendaristica, o imagine, etc.
Correct Answer(s)
A. Este o proprietate a unei entitati sau un detaliu referitor la acesta.
B. Descrie, cuantifica, califica, clasifica sau specifica o entitate
C. Are un tip care poate fi un numar, un sir de caractere, o data calendaristica, o imagine, etc.Explanation
The correct answer includes three statements that describe the attribute. First, an attribute is a property or detail related to an entity. Second, it describes, quantifies, qualifies, classifies, or specifies an entity. Third, it has a type that can be a number, a string of characters, a calendar date, an image, etc. These statements collectively define what an attribute is and its characteristics.Rate this question:
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- 7.
Unele atribute trebuie neaparat sa aiba valoare. Acestea se numesc :
- A.
Mandatorii (obligatorii)
- B.
Optionale
Correct Answer
A. Mandatorii (obligatorii)Explanation
Some attributes must have a value, and these are called "mandatorii" or "obligatorii" (mandatory or obligatory).Rate this question:
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- 8.
Relatia:
- A.
Reprezinta ceva semnificativ pentru afacere
- B.
Exprima care sunt legaturile intre doua entitati (sau intre una si aceeasi entitate).
- C.
Se citeste in ambele sensuri
- D.
Are optionalitate
- E.
Toate celelalte variante
- F.
Are un grad de cardinalitate
Correct Answer
E. Toate celelalte variante -
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Mar 21, 2023Quiz Edited by
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Oct 07, 2018Quiz Created by
Lilip
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