Answer Posted / viresh rajput

primary key:- The attribute or combination of attributes
that uniquely identifies a row or record.

Foreign Key:- an attribute or combination of attribute in a
table whose value match a primary key in another table.

Composite key:- A primary key that consistsof two or more
attributes is known as composite key

candidate key:-A candidate key uniquely identifies the rows
in a table.there can be more than 1 candidate key in a
table, in which one should be a primary key.


Alternate Key:- Any of the candidate keys that is not part
of the primary key is called an alternate key.

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