3.   Draw each of the Basic ERD Symbols and explain What each one is.

 

Anything About which we  wish to keep Information:

 

·       A Person

·       A Place

·       A Thing

·      A Concept

·      An Object

·      An Event

Text Box: Weak Entity

Entity
 

 

 

 

 


 An Entity which Exists Only as the result of another Entity

 

 

 

 


     An Association Between Entity Types

 

 

 

 


An Association Between Entity Types with attributes of its own    

 

 

 

 


     

         Fields within a record (Entity Instances)

 

 

 


Fields within a record That are either Multivalued OR can be decomposed into separate fields (Composite Attributes)

 

 

 

Connectors between other elements