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Regarding candidate keys which of the following is true?
Like primary keys, there can only be one per tuple.
A candidate key is the reference point used to link records between tables in a RDMS.
A primary key is also a candidate key.
A candidate key is always a singular field used to define a tuple.
A candidate key is a column, or set of columns, in a table that can uniquely identify any database record (AKA tuple) without referring to any other data. Each table may have one or more candidate keys, but one candidate key is special, and it is called the primary key.
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