Answer / 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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