Database Management Systems Mcqs

Page No. 8

The problem of ordering the update in multiple updates is avoided using


aSet


bWhere


cCase


dWhen


View Answer Case

_________ are useful in SQL update statements, where they can be used in the set clause.


aMultiple queries


bSub queries


cUpdate


dScalar subqueries


View Answer Scalar subqueries

UPDATE instructor _____ salary= salary * 1.05;
Fill in with correct keyword to update the instructor relation.


aWhere


bSet


cIn


dSelect


View Answer Set

Which one of the following deletes all the entries but keeps the structure of the relation.


aDelete from r where P;


bDelete from instructor where dept name= ’Finance’;


cDelete from instructor where salary between 13000 and 15000;


dDelete from instructor;



Delete from r where P;
The above command


aDeletes a particular tuple from the relation


bDeletes the relation


cClears all entries from the relation


dAll of the mentioned



A Delete command operates on ______ relation.


aOne


bTwo


cSeveral


dNull


View Answer One

In SQL the statement select * from R, S is equivalent to


aSelect * from R natural join S


bSelect * from R cross join S


cSelect * from R union join S


dSelect * from R inner join S



The operation which is not considered a basic operation of relational algebra is


aJoin


bSelection


cUnion


dCross product


View Answer Join

Which join refers to join records from the right table that have no matching key in the left table are include in the result set:


aLeft outer join


bRight outer join


cFull outer join


dHalf outer join


View Answer Right outer join

How many tables may be included with a join?


aOne


bTwo


cThree


dAll of the mentioned


View Answer All of the mentioned

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