What is a primary key? How do the properties of a primary key differ from those of a candidate key?

QUESTION:

What is the primary key? How do the properties of a primary key differ from those of a candidate key?

ANSWER:

A primary key is a candidate key that in addition to having the uniqueness and irreducibility properties also satisfies the entity integrity constraint (i.e., a primary key cannot have a missing value).

 

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