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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.
SET concept is used in which type of modelling? SET concept is used in Network Model.
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WHAT IS SQL
#what is cursor its uses ? Explain it
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