Computer : : Database Management System Questions & Answers

  1. The process of reading a database schema and producing a data model from that schema is known as

A. Data modeling

B. Reverse engineering

C. Database design

D. None of above

  1. Which of the following modifications may not succeed?

A. Changing a column data type from char to date

B. Changing a column data type from numeric to char

C. Both of the above actions should succeed

D. Neither of the above actions will succeed

  1. To drop a column that is used as a foreign key, first

A. drop the primary key

B. drop the table containing the foreign key

C. drop the foreign key constraint

D. All of above

  1. Which is not true of a correlated subquery?

A. EXISTS/NOT EXISTS is a form of a correlated subquery

B. The processing of the SELECT statements is nested

C. They can be used to verify functional dependencies

D. They are very similar to a regular subquery

  1. Which of the following is a technique for hiding the internal implementation details of an object?

A. Encapsulation

B. Polymorphism

C. Inheritance

D. None of above