pure agony

Question 1

strong entites
weak entitys
attributes

Answer 1

existence ndot dependent. singlar box around text
existence dependent on other entity types.
circles(underlined if primary key)

Question 2

Canidate key
Primary key

Answer 2

min # of attributes that uniquely identifies each occurence of an entity type

Canidate key chosen to ID each occurence of an entity.

Question 3

should attribute be entity

Answer 3

multi valued attributes may be entity
Attributes with attributes
E-r diagram must be accurate for any instance in time. for example job applicatant—–Employee. (not valid)

Question 4

Want to get rid of many to many relationship by using netity that connects them