The Rule Broken Most Often

• Rule #6 May be Broken IF
• ERD shows many entities clustered around a central entity
• The Central Entity has several One-to-Many relationships with the surrounding entities
• The surrounding entities have no relationships with any other entity

Customer

customer-id

Email

email-id

Phone

Phone-id

Address

address-id

CreditCard

creditcard-id

Lives

At

has

has

Pays

With