Oracle
1Z0-071 · Question #320
1Z0-071 Question #320: Real Exam Question with Answer & Explanation
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Question
Which three statements are true about defining relations between tables in a relational database? (Choose three.)
Options
- APrimary key columns allow null values.
- BEvery primary or unique key value must refer to a matching foreign key value.
- CForeign key columns allow null values.
- DEvery foreign key value must refer to a matching primary or unique key value.
- EUnique key columns allow null values.
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