O'Reilly logo

Database Systems: Concepts, Design and Applications by S. K. Singh

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Tick (✓) the Appropriate Answer

1.The U-shaped symbols on each line connecting a subtype to the circle, indicates that the subtype is a
  1. subset of the supertype.

  2. direction of supertype/subtype relationship.

  3. both of these.

  4. none of these.

2.The uses of specialisation or generalisation technique for a particular situation depends on
  1. the nature of the problem.

  2. the nature of the entities and relationships.

  3. the personal preferences of the database designer.

  4. all of these.

3.In specialisation, the differences between members of an entity is
  1. maximized.

  2. minimized.

  3. both of these.

  4. none of these.

4.In generalisation, the differences between members of an entity is
  1. maximized.

  2. minimized.

  3. both of these.

  4. none of these.

5.Specialisation is a
  1. top-down process of defining superclasses ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required