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

Which of the following products was the first to implement true relational algebra in a PC DBMS?

• [A] Oracle
• [B] R:base
• [C] IDMS
• [D] dBase-II

An abstract class is which of the following?

• [A] A class that has direct instances, but whose descendants may have direct instances.
• [B] A class that has no direct instances, but whose descendants may have direct instances.
• [C] A class that has direct instances, but whose descendants may not have direct instances.
• [D] A class that has no direct instances, but whose descendants may not have direct instances

............... joins are SQL server default

• [A] outer
• [B] inner
• [C] equi
• [D] none

An intrusion detection system does not perform which of the following?

• [A] Tries to identify attempts to hack into a computer system.
• [B] May monitor packets passing over the network.
• [C] May transmit message packets to the correct destination.
• [D] Set up deception systems that attempt to trap hackers.

How many copies of the database schema are typically used in the redesign process?

• [A] One
• [B] Two
• [C] three
• [D] four