Examlex
In order for a database to be relational,one of the requirements is that each row must have a primary key able to uniquely identify one record from another.
Prototype
A typical or initial model of something from which other forms are developed or copied, often used in the context of design and innovation.
Exemplar
A representative example of a category or class, often used to illustrate or explain concepts.
Prototype
A typical or standard example of a particular category or concept, serving as a representative model.
Category
A category is a class or division of people or things regarded as having particular shared characteristics.
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