Database Management Systems Mcqs

Page No. 18

In domain relational calculus “there exist” can be expressed as


a(P1(x))


b(P1(x)) Э x


cV x (P1(x))


dЭ x (P1(x))


View Answer Э x (P1(x))

An expression in the domain relational calculus is of the form


a{P(x1, x2, . . . , xn) | < x1, x2, . . . , xn > }


b{x1, x2, . . . , xn | < x1, x2, . . . , xn > }


c{ x1, x2, . . . , xn | x1, x2, . . . , xn}


d{< x1, x2, . . . , xn > | P(x1, x2, . . . , xn)}



Which of the following is the comparison operator in tuple relational calculus


a


b=


cε


dAll of the mentioned


View Answer =

“Find all students who have taken all courses offered in the Biology department.” The expressions that matches this sentence is :


aЭ t ε r (Q(t))


b∀ t ε r (Q(t))


c¬ t ε r (Q(t))


d~ t ε r (Q(t))


View Answer ∀ t ε r (Q(t))

Which of the following symbol is used in the place of except?


a^


bV


c¬


d~


View Answer ¬

A query in the tuple relational calculus is expressed as:


a{t | P() | t}


b{P(t) | t }


c{t | P(t)}


dAll of the mentioned


View Answer {t | P(t)}

Find the ID, name, dept name, salary for instructors whose salary is greater than $80,000 .


a{t | t ε instructor ∧ t[salary] > 80000}


bЭ t ∈ r (Q(t))


c{t | Э s ε instructor (t[ID] = s[ID]∧ s[salary] > 80000)}


dNone of the mentioned



In a relation between the entities the type and condition of the relation should be specified. That is called as______attribute.


aDesciptive


bDerived


cRecursive


dRelative


View Answer Desciptive

Which of the following is a single valued attribute


aRegister_number


bAddress


cSUBJECT_TAKEN


dReference


View Answer Register_number

Which of the following can be a multivalued attribute?


aPhone_number


bName


cDate_of_birth


dAll of the mentioned


View Answer Phone_number

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