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Define candidate key, alternate key, composite key.
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Answer Posted / anvar shadath.a
Candidate key: If any unique data column(s)in table is
called candidate key. may be one or more unique data column
(s).We can select any one unique (candidate key column) as
a primary key.
Alternate key: If one table contains more then one
candidate keys, remining candidate keys column(s) which is
not selected as a primary key is called Alternate Key.
Composite key: One primary key Contains more then one
columns is called Composite key.
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