List

• Logical Data Modeling - Primary Key (Id, Name) - A primary key is that candidate key which will most commonly be used to uniquely identify a single entity instance.
• Logical Data Modeling - Unique Key
• Surrogate Key
• Natural Key
• Logical Data Modeling - Business Key
• alternate key - Any candidate key that is not selected to become the primary key is called an alternate key.
• concatenated key - A group of attributes that uniquely identifies an entity is called a concatenated key.

Data Type

An identifier data type must be able to hold any key value.

A common implementation of this data type is an integer (64 bit :))