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Exam 1z0-071 topic 1 question 239 discussion

Actual exam question from Oracle's 1z0-071
Question #: 239
Topic #: 1
[All 1z0-071 Questions]

Which three statements are true about defining relations between tables in a relational database? (Choose three.)

  • A. Primary key columns allow null values.
  • B. Every primary or unique key value must refer to a matching foreign key value.
  • C. Every foreign key value must refer to a matching primary or unique key value.
  • D. Foreign key columns allow null values.
  • E. Unique key columns allow null values.
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Suggested Answer: CDE 🗳️
by kay000001 at Oct. 27, 2024, 6:38 a.m.

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bfb7c7d
2 months ago
primary key and unique key columns are the same thing so answer could be A as well.
upvoted 1 times
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kay000001
2 months, 2 weeks ago
Selected Answer: CDE
Answers, C D E are correct.
upvoted 1 times
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