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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.
brief history,definition,current trends and future trends if any of data fragmentation
what is primary key
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What is transaction? Transaction is a unit of program implementation that accesses and possibly updated several data items.
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