relational-model

Consider two relations describing teams and players in a sports league: $\bullet$ teams(tid, tname): tid, tname are team-id and team-name, respectively. $\bullet$ players(pid, pnam...

Which one of the options given below refers to the degree (or arity) of a relation in relational database systems?

Consider the following statements S1 and S2 about the relational data model: S1: A relation scheme can have at most one foreign key. S2: A foreign key in a relation scheme R cannot...

The maximum number of superkeys for the relation schema $$R(E, F, G, H)$$ with $$E$$ as key is ______.

A prime attribute of a relation scheme $$R$$ is an attribute that appears

Given the basic $$ER$$ and relational models, which of the following is INCORRECT?

Consider a relation table with a single record for each registered student with a single record for each registered student with the following attributes. $$1.$$ $$Registration$$ $...

Let $${E_1}$$ and $${E_2}$$ be two entities in an E-R diagram with simple single-valued attributes, $${E_1}$$ and $${E_2}$$ are two relationships between $${E_1}$$ and $${E_2}$$, W...

Let $$R=(A,B,C,D,E,F)$$ be a relation scheme with the following dependencies: $$C \to F,\,E \to A,\,EC \to D,\,A \to B.$$ Which of the following is a key for $$R?$$