Relational Database Management System Mcqs

Page No. 9

The _______ statement makes the updates performed by the transaction permanent.


aFinalize work


bFinish work


cCommit work


dNone of the mentioned


View Answer Commit work

State true or false: We can update a view if it has multiple database relations in the from clause


aTrue


bFalse


ceither true and false


dnone of the mentioned


View Answer False

How can we insert data into a view?


ainsert into ();


bcreate data values ();


center ();


dinsert into values ();



The process of maintaining views up to date is called _________


aView maintenance


bView updating


cView materialization


dView isolation


View Answer View maintenance

If the actual relations used in the view definition change, the view is updated immediately. Such views are called _________


aInstant views


bInstantaneous views


cMaterialistic views


dMaterialized views


View Answer Materialized views

State true or false: One view can be used in the expression defining another view


aTrue


bFalse


ceither true and false


dnone of the mentioned


View Answer True

What is the result of the above query?


a It creates a view named studentdet with 3 attributes


bIt creates a view named studentdet with 1 attribute


cIt creates a view named ID with 2 attributes


d It is syntactically wrong and does not give a result



What is the command used to define view in SQL?


adefine view


bnew view


ccreate view


dnone of the mentioned


View Answer create view

What is a view?


aAn brief description of the schema diagram.


bA relation that is not a part of the schema but is a virtual relation


cAny relation that is a part of the schema


dA relation that is a part of the schema but which needs to be specified in every operation made on that particular relation.



What statement is used to define a new assertion in SQL?


acreate check ;


bcreate assertion where ;


ccreate where ;


dcreate assertion check ;



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