Candidate Key is a key that may have many duplicates may be absent may be a foreign key contain only unique values and fully defines all other attributes in a row

Oracle 12c: SQL
3rd Edition
ISBN:9781305251038
Author:Joan Casteel
Publisher:Joan Casteel
Chapter4: Constraints
Section: Chapter Questions
Problem 1RQ: What is the difference between a PRIMARY KEY constraint and a UNIQUE constraint?
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  1. Candidate Key is a key that
       
    may have many duplicates
       
    may be absent
       
    may be a foreign key
       
    contain only unique values and fully defines all other attributes in a row
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