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MCQ

For select operation the ________ appear in the subscript and the ___________ argument appears in the paranthesis after the sigma.

Predicates, relation

Relation, Predicates

Operation, Predicates

Relation, Operation

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Which of the following best describes the query?


{t | ? s ? instructor (t[name] = s[name]
? ? u ? department (u[dept name] = s[dept name]
? u[building] =



            
                                                            
                            
                            A
                            
                                Finds the names of all instructors whose department is in the Watson building                            
                        
                                            
                            
                            B
                            
                                Finds the names of all department is in the Watson building                            
                        
                                            
                            
                            C
                            
                                Finds the name of the dapartment whose instructor and building is Watson                            
                        
                                            
                            
                            D
                            
                                Returns the building name of all the departments                            
                        
                                                

            
                Correct Answer: A
                None.



        
            
            
                            
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                MCQ            
            
        

        
            
                2.
                Which one of the following is a procedural language?
            

            
                                                            
                            
                            A
                            
                                Domain relational calculus                            
                        
                                            
                            
                            B
                            
                                Tuple relational calculus                            
                        
                                            
                            
                            C
                            
                                Relational algebra                            
                        
                                            
                            
                            D
                            
                                Query language                            
                        
                                                

            
                Correct Answer: C
                None.
            
        

        
            
            
                            
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                3.
                Consider attributes ID, CITY and NAME. Which one of this can be considered as a super key?
            

            
                                                            
                            
                            A
                            
                                NAME                            
                        
                                            
                            
                            B
                            
                                ID                            
                        
                                            
                            
                            C
                            
                                CITY                            
                        
                                            
                            
                            D
                            
                                CITY, ID                            
                        
                                                

            
                Correct Answer: B
                None.
            
        

        
            
            
                            
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                4.
                The _______operation performs a set union of two 
            

            
                                                            
                            
                            A
                            
                                Union                            
                        
                                            
                            
                            B
                            
                                Join                            
                        
                                            
                            
                            C
                            
                                Product                            
                        
                                            
                            
                            D
                            
                                Intersect                            
                        
                                                

            
                Correct Answer: A
                None.
            
        

        
            
            
                            
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                MCQ            
            
        

        
            
                5.
                An entity set that does not have sufficient attributes to form a primary key is a
            

            
                                                            
                            
                            A
                            
                                strong entity set.                            
                        
                                            
                            
                            B
                            
                                weak entity set.                            
                        
                                            
                            
                            C
                            
                                simple entity set.                            
                        
                                            
                            
                            D
                            
                                primary entity set.                            
                        
                                                

            
                Correct Answer: B
                None.
            
        

        
            
            
                            
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category More Database Management System Topics

Miscellaneous or General

Relational Algebra

Database Systems

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Entity Relationship (ER) Modeling

Advanced Data Modeling

Normalization

Structured Query Language (SQL)

Advanced SQL

Database Design

Transaction and Concurrency

Data Warehouses

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