Relational Database Management System Mcqs

Page No. 8

Which off the following is not a valid type of join?


aleft outer join

✖


bouter join

✖


cjoin

✖


dfull join

✓


View Answer full join

State true or false: on and where behave differently for outer join


aTrue

✓


bFalse

✖


ceither true and false

✖


dnone of the mentioned

✖


View Answer True

What is the function of inner join?


aIt preserves tuples only in the relation named before the operation

✖


bIt preserves tuples only in the relation named after the operation

✖


c It preserved tuples in the relations named on both the sides of the operation

✖


d It does not preserve any tuples on either side of the relation

✓


View Answer It does not preserve any tuples on either side of the relation

What is the function of a right outer join?


a It preserves tuples only in the relation named before the operation

✖


bIt preserves tuples only in the relation named after the operation

✓


cIt preserved tuples in the relations named on both the sides of the operation

✖


dIt does not preserve any tuples on either side of the relation

✖


View Answer It preserves tuples only in the relation named after the operation

What is the function of a full outer join?


a It preserves tuples only in the relation named before the operation

✖


bIt preserves tuples only in the relation named after the operation

✖


cIt preserved tuples in the relations named on both the sides of the operation

✓


dIt does not preserve any tuples on either side of the relation

✖


View Answer It preserved tuples in the relations named on both the sides of the operation

What is the function of a left outer join?


a It preserves tuples only in the relation named before the operation

✓


bIt preserves tuples only in the relation named after the operation

✖


cIt preserved tuples in the relations named on both the sides of the operation

✖


dIt does not preserve any tuples on either side of the relation

✖


View Answer It preserves tuples only in the relation named before the operation

The join operations that do not retain mismatched tuples are called as _________ operations


aouter join

✖


bnatural join

✖


cfull outer join

✖


dinner join

✓


View Answer inner join

What is the difference between a join and an outer join operation?


aThere is no difference

✖


bJoin preserves a few tuples that are otherwise lost in the outer join

✖


cOuter join preserves a few tuples that are otherwise lost in the join

✓


dAn outer join can be used only on outer queries whereas a join operation can be used in Subqueries

✖


View Answer Outer join preserves a few tuples that are otherwise lost in the join

The on condition appears at the _______ of the join expression


aBeginning

✖


bEnd

✓


cBetween

✖


dThe on condition is not related to join expression

✖


View Answer End

The _______ statement causes the statements to undo all the updates performed on the transaction


aUndo work

✖


bRollback work

✓


cCommit work

✖


dReplace work

✖


View Answer Rollback work

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