Relational Database Management System Mcqs

Page No. 14

Πcustomer_name, loan_number, amount (borrower ⋈loan) What does the above expression perform?


a It finds the customer_name, loan_number and amount from borrower

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bIt finds the customer_name, loan_number and amount from loan

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cIt finds the customer_name, loan_number and amount from the full outer join of borrower and loan

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dIt finds the customer_name, loan_number and amount from the natural join of borrower and loan

✓



How is the right outer join symbol represented in relational algebra?


a⟕

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b⟖

✓


c⟗

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d⋈

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View Answer ⟖

How is the left outer join symbol represented in relational algebra?


a⟕

✓


b ⟖

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c⟗

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d⋈

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View Answer ⟕

What does the following relational algebra expression do? σamount > 1200 (loan)


a Finds all the tuples in loan

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bFinds the tuples in loan where the amount is greater than 12000

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cFinds all the tuples in loan where the amount is greater than 1200

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dFinds all the amounts in loan where the number of values is greater than 1200

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What does the following relational operation perform? ρx(A1,A2,A3…) (E)


a It returns the result of expression E with the previous attribute names

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bIt returns the result of expression E renaming the attributes as A1, A2, …

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cIt returns the result of the relation E but saves the old attributes

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dNone of the mentioned

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The project operation’s function in relational algebra is identical to the _______ clause in SQL


awhere

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bfrom

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cselect

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dnone of the mentioned

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View Answer select

The select operation’s function in relational algebra is identical to the _______ clause in SQL


a where

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bfrom

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cselect

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dnone of the mentioned

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View Answer where

Which of the following is not a relational algebra function?


a Select

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bProject

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cManipulate

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dUnion

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View Answer Manipulate

Which of the following is a good database management practice?


aAdding redundant attributes

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bRemoving redundant attributes

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cNot specifying primary keys

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d None of the mentioned

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State true or false: Multiple attributes combined together can be primary keys


aTrue

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b False

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ceither true of false

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dnone of these

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View Answer True

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