Quiz Discussion

Materialized views make sure that

• 1]

  View definition is kept stable

• 2]

  View definition is kept up-to-date

• 3]

  View definition is verified for error

• 4]

  View is deleted after specified time

For the view Create view instructor_info as

SELECT ID, name, building
FROM instructor, department
WHERE instructor.dept name= department.dept name;

If we insert tuple into the view as insert into instructor info values (’69987’, ’White’, ’Taylor’);
What will be the values of the other attributes in instructor and department relations?

• 1]

  Default value

• 2]

  Null

• 3]

  Error statement

• 4]

  0

Updating the value of the view

• 1]

  Will affect the relation from which it is defined

• 2]

  Will not change the view definition

• 3]

  Will not affect the relation from which it is defined

• 4]

  Cannot determine

Which of the following is used at the end of the view to reject the tuples which do not satisfy the condition in where clause?

• 1]

  With

• 2]

  Check

• 3]

  With check

• 4]

  All of the mentioned

Find the error in this query. 

CREATE VIEW faculty AS
SELECT ID, name, dept name
FROM instructor;

• 1]

  Instructor

• 2]

  Select

• 3]

  View …as

• 4]

  None of the mentioned

Which of the following creates a virtual relation for storing the query?

• 1]

  Function

• 2]

  View

• 3]

  Procedure

• 4]

  None of the mentioned

Which of the following is the syntax for views where v is view name?

• 1]

  Create view v as “query name”;

• 2]

  Create “query expression” as view;

• 3]

  Create view v as “query expression”;

• 4]

  Create view “query expression”;

SELECT course_id
FROM physics_fall_2009
WHERE building= ’Watson’;

Here the tuples are selected from the view.Which one denotes the view.

• 1]

  Course_id

• 2]

  Watson

• 3]

  Building

• 4]

  physics_fall_2009

Consider the two relations instructor and department
Instructor:

Department:

Which of the following is used to create view for these relations together?

• 1]

  CREATE VIEW instructor_info AS
  SELECT ID, name, building
  FROM instructor, department
  WHERE instructor.dept name= department.dept name;

   

• 2]

  CREATE VIEW instructor_info 
  SELECT ID, name, building
  FROM instructor, department;

   

• 3]

  CREATE VIEW instructor_info AS
  SELECT ID, name, building
  FROM instructor;

   

• 4]

  CREATE VIEW instructor_info AS
  SELECT ID, name, building
  FROM department;