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The most commonly used operation in relational algebra for projecting a set of tuple from a relation is

Join

Projection

Select

Union

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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            
            
        

        
            
                2.
                The natural join is equal to :
            

            
                                                            
                            
                            A
                            
                                Cartesian Product                            
                        
                                            
                            
                            B
                            
                                Combination of Union and Cartesian product                            
                        
                                            
                            
                            C
                            
                                Combination of selection and Cartesian product                            
                        
                                            
                            
                            D
                            
                                Combination of projection and Cartesian product                            
                        
                                                

            
                Correct Answer: D
                None.
            
        

        
            
            
                            
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                3.
                The intersection operator is used to get the _____ tuples.
            

            
                                                            
                            
                            A
                            
                                Different                            
                        
                                            
                            
                            B
                            
                                Common                            
                        
                                            
                            
                            C
                            
                                All                            
                        
                                            
                            
                            D
                            
                                Repeating                            
                        
                                                

            
                Correct Answer: B
                None.
            
        

        
            
            
                            
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                4.
                The ______ is the one in which the primary key of one relation is used as a normal attribute in another relation.
            

            
                                                            
                            
                            A
                            
                                Referential relation                            
                        
                                            
                            
                            B
                            
                                Referencing relation                            
                        
                                            
                            
                            C
                            
                                Referenced relation                            
                        
                                            
                            
                            D
                            
                                Referred relation                            
                        
                                                

            
                Correct Answer: C
                None.
            
        

        
            
            
                            
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                5.
                Which of the following is used to denote the selection operation in relational algebra?
            

            
                                                            
                            
                            A
                            
                                Pi (GREEK)                            
                        
                                            
                            
                            B
                            
                                Sigma (GREEK)                            
                        
                                            
                            
                            C
                            
                                Lambda (GREEK)                            
                        
                                            
                            
                            D
                            
                                Omega (GREEK)                            
                        
                                                

            
                Correct Answer: B
                None.
            
        

        
            
            
                            
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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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More Database Management System Topics