2. Data and Databases

Relational Databases — Quiz

Test your understanding of relational databases with 5 practice questions.

Practice Questions

Question 1

Which of the following relational algebra operations is used to select a subset of rows from a relation that satisfy a given condition?

Question 2

In the context of database design, what is a 'superkey'?

Question 3

Consider a relation $R(A, B, C, D)$ with functional dependencies $F = \{A \to B, BC \to D\}$. Which of the following attributes is part of a candidate key for $R$?

Question 4

Which of the following properties of a transaction ensures that either all operations of the transaction are completed, or none of them are?

Question 5

Given two relations $R_1(A, B)$ and $R_2(B, C)$, what is the result of the natural join operation $R_1 \bowtie R_2$?