Oracle
1Z0-047 · Question #255
1Z0-047 Question #255: Real Exam Question with Answer & Explanation
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Question
Which two statements are true regarding constraints? (Choose two.)
Options
- AA foreign key cannot contain NULL values.
- BA column with the UNIQUE constraint can contain NULL.
- CA constraint is enforced only for the INSERT operation on a table.
- DA constraint can be disabled even if the constraint column contains data.
- EAll the constraints can be defined at the column level as well as the table level
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