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.
The column with a UNIQUE constraint can store NULLS .

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

D.
You can have more than one column in a table as part of a primary key.



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