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MCQ

In a relational model, relations are termed as

Tuples

Attributes

Tables

Rows

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MCQ

Which is a join condition contains an equality operator:

Equijoins

Cartesian

Natural

Left

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MCQ

Which of the following is a fundamental operation in relational algebra?

Set intersection

Natural join

Assignment

None of the mentioned

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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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                4.
                The _______ operator takes the results of two queries and returns only rows that appear in both result sets.
            

            
                                                            
                            
                            A
                            
                                Union                            
                        
                                            
                            
                            B
                            
                                Intersect                            
                        
                                            
                            
                            C
                            
                                Difference                            
                        
                                            
                            
                            D
                            
                                Projection                            
                        
                                                

            
                Correct Answer: B
                None.
            
        

        
            
            
                            
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                5.
                _________ joins are SQL server default
            

            
                                                            
                            
                            A
                            
                                Outer                            
                        
                                            
                            
                            B
                            
                                Inner                            
                        
                                            
                            
                            C
                            
                                Equi                            
                        
                                            
                            
                            D
                            
                                None of the mentioned                            
                        
                                                

            
                Correct Answer: B
                None.
            
        

        
            
            
                            
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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

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

Report Error

Community Discussion

Similar Questions

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Report Error

Report Error

Report Error

Report Error

More Database Management System Topics