Which two statements are true regarding constraints?

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

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

A.
A foreign key cannot contain NULL values.

B.
A column with the UNIQUE constraint can contain NULL.

C.
A constraint is enforced only for the INSERT operation on a table.

D.
A constraint can be disabled even if the constraint column contains data.

E.
All the constraints can be defined at the column level as well as the table level



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