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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.
complete assignment on the above title.
deffine class&object
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courier company er-diagram
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SET concept is used in which type of modelling? SET concept is used in Network Model.
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