4.   Explain What Cardinality is, why it is important, and what basic symbols are used to represent it.

 

• Cardinality Indicates how Entity Instances are related to each other.
• Without cardinality, we would not know where to place the foreign keys necessary to relate tables together

 

 

 

 

 

1:1 Relationships:

 

 

 

 

 

 

 

 

 

 

 

 

1:M Relationships:

 

 

 

 

 

 

 

 

 

 

 

M:M Relationships: