An attribute whose values match primary key values in the related table
Candidate key
A superkey that does not have redundancy and has potential as primary key.
Foreign key
Composed of more than one attribute
Secondary key
A candidate key selected to uniquely identify all other attribute in given row and cannot contain null value.
Primary key
A key that is used strictly for data retrieval.
Superkey
Any attribute that is part of a key
Composite key
Any key that uniquely identifies each entity
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