................. requires that data should be made available to only authorized users.

Which of the following SQL statements are helpful in database redesign?

• [A] Correlated subqueries only
• [B] EXISTS/NOT EXISTS expressions only
• [C] Both of the above are helpful
• [D] None of the above are helpful.

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

• [A] data modeling.
• [B] database design.
• [C] reverse engineering.
• [D] None of the above is correct.

The level of abstraction describes only part of the entire database is called?

• [A] Conceptual level
• [B] View Level
• [C] Procedural Level
• [D] None of above

Features of XML include which of the following?

• [A] The tags are used to describe the appearance of the content.
• [B] Addresses the structuring and manipulation of the data involved.
• [C] Governs the display of information in a Web browser.
• [D] All of the above.

An object can have which of the following multiplicities?

• [A] Zero
• [B] One
• [C] More than one
• [D] All of the above.