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DA0-001 · Question #155
DA0-001 Question #155: Real Exam Question with Answer & Explanation
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Data Concepts and Environments
Question
Which of the following is a difference between a primary key and a unique key?
Options
- AA unique key cannot take null values, whereas a primary key can take null values.
- BThere can be only one primary key in a data set, whereas there can be multiple unique keys.
- CA primary key can take a value more than once, whereas a unique key cannot take a value more
- DA primary key cannot be a date variable, whereas a unique key can be.
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Topics
#Primary Key#Unique Key#Database Concepts#Data Integrity