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


bIt finds the customer_name, loan_number and amount from loan


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


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


b


c


d


View Answer

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


a


b


c


d


View Answer

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


a Finds all the tuples in loan


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


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


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



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


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


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


dNone of the mentioned



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


awhere


bfrom


cselect


dnone of the mentioned


View Answer select

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


a where


bfrom


cselect


dnone of the mentioned


View Answer where

Which of the following is not a relational algebra function?


a Select


bProject


cManipulate


dUnion


View Answer Manipulate

Which of the following is a good database management practice?


aAdding redundant attributes


bRemoving redundant attributes


cNot specifying primary keys


d None of the mentioned



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


aTrue


b False


ceither true of false


dnone of these


View Answer True

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