DBMS-Relational Algebra and Calculus Questions and Answers

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Showing 10 of 81 questions
Q11
A table can have only one alternate key
  • A TRUE
  • B FALSE
Answer: Option B
Q12
A table can have only one candidate key.
  • A TRUE
  • B FALSE
Answer: Option B
Q13
The foreign key and the primary key should be defined on the same underlying domain.
  • A TRUE
  • B FALSE
Answer: Option A
Q14
A relation always has a unique identifier.
  • A TRUE
  • B FALSE
Answer: Option A
Q15
Primary key performs the unique identification function in a relational database model.
  • A TRUE
  • B FALSE
Answer: Option A
Q16
In a reality, NULL is not a value, but rather the absence of a value.
  • A TRUE
  • B FALSE
Answer: Option A
Q17
Relational database is a finite collection of relations and a relation in terms of domains, attributes, and cuples.
  • A TRUE
  • B FALSE
Answer: Option A
Q18
Atomic means that each value in the domain is indivisible to the relational model.
  • A TRUE
  • B FALSE
Answer: Option A
Q19
Superkey is an attribute, or set of attributes, that uniquely indentifies a tuple within a relation
  • A TRUE
  • B FALSE
Answer: Option A
Q20
Codd defined well-formed formulas (WFFs).
  • A TRUE
  • B FALSE
Answer: Option A

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