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Exam DA0-001 topic 1 question 86 discussion

Actual exam question from CompTIA's DA0-001
Question #: 86
Topic #: 1
[All DA0-001 Questions]

Which of the following is a difference between a primary key and a unique key?

  • A. A unique key cannot take null values, whereas a primary key can take null values.
  • B. There can be only one primary key in a data set, whereas there can be multiple unique keys.
  • C. A primary key can take a value more than once, whereas a unique key cannot take a value more than once.
  • D. A primary key cannot be a date variable, whereas a unique key can be.
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Suggested Answer: B 🗳️
by Swift_and_Quick at April 16, 2024, 9:06 p.m.

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Swift_and_Quick
6 months, 3 weeks ago
B. In a given table, only one primary key can be defined, but multiple unique keys can be defined to enforce uniqueness on different columns.
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