Diff between Composite key, Alternate Key, Candidate Key,
Primary Key, Unique Key, Super Key, Foreign Key
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Answer Posted / sapan saxena
Super Key: All possible keys which can identify entities in
the table uniquely.
Primary Key: uniquely identify each entity in the table and
does not contain null and duplicate vales.
Composite key: The combination of two or more than two keys
which identifies entities uniquely.
Candidate Key: Nominee for the primary key.
Alternate Key: Rest of the candidate keys which is not the
primary key.
Unique Key: Same as primary key but can accept one null key
only.
Foreign Key: A foreign key is one or more columns whose
value must exist in the primary key of another table.
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