Oracle
1Z0-071 · Question #139
1Z0-071 Question #139: Real Exam Question with Answer & Explanation
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Question
Which two statements are true regarding constraints? (Choose two.)
Options
- AAll constraints can be defined at the column level and at the table level.
- BA constraint can be disabled even if the constraint column contains data.
- CA column with the UNIQUE constraint can contain NULLS.
- DA foreign key column cannot contain NULLS.
- EA constraint is enforced only for INSERT operations.
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