
BD1 CB partial
Authored by Andrada Canțu
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University
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50 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Identificatorul unei entități devine la transformare:
Cheia primară
O cheie străină
Constrângeri de tip NOT NULL
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
O dependenta de forma ABC → A este o dependenta :
Triviala
Transpusa
Augmentata
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Numarul de chei pentru o relatie este:
O relatie poate sa nu aiba nici o cheie
Maxim una
Minim una
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Cu ajutorul unei diagrame entitate-asociere descriem:
structura unei baze de date
continutul unei tabele din baza de date
structura unei tabele din baza de date
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Functia referitoare la confidentialitatea datelor in cazul unui SGBD inseamna ca exista posibilitatea:
operatiilor de lucru cu datele inregistrate intr-o baza de date
crearii si modificarii structurii tabelelor si a constrangerilor de integritate asociata acestora
operatiilor prin care accesul la date este permis doar utilizatorilor inregistrati si doar in masura drepturilor de acces alocate
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In sistemele relationale, descrierea structurii bazei de date este stocata in acelasi mod ca si in baza de date in sine?
Adevarat
Fals
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Constrangerile de integritate sunt:
restrictii si verificari asupra operatiilor care pot fi executate de un utilizator
restrictii si verificari asupra tipurilor de date care pot fi utilizate de un utilizator
restrictii si verificari de corectitudine pentru datele stocate
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