
Algebra relationala
Authored by Eugenia Covali
Computers
Professional Development
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12 questions
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1.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
Ce este algebra relațională
Un limbaj teoretic cu operații asupra ralațiilor
U limbaj SQL
Este o parte componentă a BD
SGBD
2.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
Selectași operațiile tradiționale pe mulțimi
Uniunea
Intersecția
Diferența
Proiecția
3.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
Selectați operații relaționale native
Diferența
Proiecția
Selecția
Joncțiunea
4.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
Ce operație este notată prin simbolul
Selecția
Diferența
Joncțiunea naturală
Proiecția
5.
MULTIPLE SELECT QUESTION
20 sec • 1 pt
Care dintre operațiile de mai jos se bucură de proprietatea comutativă
Diferența
Produsul cartezian
Semijoncțiunea
Joncțiunea naturală
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Este adevarată expresia
Da
Nu
7.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
Ce operație este reprezentată în imagine?
INNER JOIN-joncțiunea naturală
RIGHT JOIN-joncțiunea de dreapta
LEFT JOIN-joncțiunea de stânga
FULL JOIN -joncțiunea completă
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