Define partial key and primary key, Database Management System

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Define Partial Key and Primary Key

A partial key, also known as discriminator, is the set of attributes which can uniquely identify weak entities that are related to similar owner entity. Primary key is a unique key but not comprise null values. An entity set can comprise at most one primary key.

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#title., WHY SHOULD NULL IN A RELATION BE AVOID AS possible?

WHY SHOULD NULL IN A RELATION BE AVOID AS possible?

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