Which two statements are true regarding constraints? (Choose two.)

Question

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.

• A
  13% (5)
• B
  80% (32)
• D
  3% (1)
• E
  5% (2)

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