Section 3

1. Consider the recommended drawing conventions for ERD's.
Indicate which of the following accurately describes diagramming conventions for entities and attributes:

The * means that an attribute is optional and entity names should be plural verbs

The 'o' means that the attribute is optional and entity names should be plural verbs

  The * means that an attribute is mandatory or required and the entity name should be singular

The 'o' means that the attribute is mandatory or required and the entity name should be a singular noun

   

  2. Attributes are written inside the entity to which they belong. True or False?

  True 

False


   
  3. Entity boxes are drawn as

  Soft Boxes 

Hard Boxes

Bold Circles

Normal Circles


   
  4. Entity names are always plural. True or False?

True

  False 

   

  5. Which symbol is used to show that a particular attribute is optional?

*

  o 

#

&


   
  6. On an ER diagram which symbol identifies an attribute as part of a unique identifier.

  #

*

o

x