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Which one of the following is a set of one or more attributes taken collectively to uniquely identify a record?

Candidate key

Sub key

Super key

Foreign key

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MCQ

Which one of the following attribute can be taken as a primary key?

Name

Street

Department

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MCQ

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            
            
        

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

            
                                                            
                            
                            A
                            
                                ?                            
                        
                                            
                            
                            B
                            
                                =                            
                        
                                            
                            
                            C
                            
                                ?                            
                        
                                            
                            
                            D
                            
                                All of the mentioned                            
                        
                                                

            
                Correct Answer: B
                None.
            
        

        
            
            
                            
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                5.
                An attribute in a relation is a foreign key if the _______ key from one relation is used as an attribute in that relation.
            

            
                                                            
                            
                            A
                            
                                Candidate                            
                        
                                            
                            
                            B
                            
                                Primary                            
                        
                                            
                            
                            C
                            
                                Super                            
                        
                                            
                            
                            D
                            
                                Sub                            
                        
                                                

            
                Correct Answer: B
                None.
            
        

        
            
            
                            
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Normalization

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Advanced SQL

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Transaction and Concurrency

Data Warehouses

Database Administration

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Banking

Engineering

General

Medical

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category More Database Management System Topics

Miscellaneous or General

Relational Algebra

Database Systems

Data Models

The Relational Database Model

Entity Relationship (ER) Modeling

Advanced Data Modeling

Normalization

Structured Query Language (SQL)

Advanced SQL

Database Design

Transaction and Concurrency

Data Warehouses

Database Administration

Mixed

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Community Discussion

Similar Questions

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More Database Management System Topics