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Describe the primary key functions?
Primary Key : The primary key is an attribute or a set of attributes in which uniquely identify a specific example of an entity. Every entity in the data model must have a primary key whose values uniquely recognize instances of the entity.
To qualify as a primary key for an entity, an attribute must have the subsequent properties: * It must have a non-null value for each instance of the entity. * The value must be unique for each instance of an entity * The values must not change or become null during the life of each entity instance.
Which file organization provides very fast access to any arbitrary record of a file? Hashed file organization provides very fast access to any arbitrary record of a file.
What is Alternate Key Alternate Key: This is the candidate key which is not taken as the primary key of the table. They are named so because although not the primary key, the
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Attributes and its types explain?
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