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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.
what do you mean by primary key constraint?
Which is the properties of entities? Attributes is the properties of entities.
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we need example of 2phase locking
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