Database Test Online Exam Quiz
Database Test GK Quiz. Question and Answers related to Database Test. MCQ (Multiple Choice Questions with answers about Database Test
In domain relaional calculus “there exist” can be expressed as
Options
A : (P1(x))
B : (P1(x)) ? x
C : V x (P1(x))
D : ? x (P1(x))
An expression in the domain relational calculus is of the form
Options
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)}
A query in the tuple relational calculus is expressed as:
Options
A : {t | P() | t}
B : {P(t) | t }
C : {t | P(t)}
D : All of the mentioned
Find the ID, name, dept name, salary for instructors whose salary is greater than $80,000 .
Options
A : {t | t ? instructor ? t[salary] > 80000}
B : ? t ? r (Q(t))
C : {t | ? s ? instructor (t[ID] = s[ID]? s[salary] > 80000)}
D : None of the mentioned
Which of the following is the comparison operator in tuple relational calculus
Options
A : ?
B : =
C : ?
D : All of the mentioned
A set of possible data values is called
Options
A : Attribute
B : Degree
C : Tuple
D : Domain
“Find all students who have taken all courses offered in the Biology department.” The expressions that matches this sentence is :
Options
A : ? t ? r (Q(t))
B : ? t ? r (Q(t))
C : ¬ t ? r (Q(t))
D : ~ t ? r (Q(t))
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