Oracle

1Z0-061 · Question #274

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

The correct answer is B. The column with a UNIQUE constraint can store NULLS . D. You can have more than one column in a table as part of a primary key. See the full explanation below for the reasoning.

Question

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

Options

AA foreign key cannot contain NULL values.
BThe column with a UNIQUE constraint can store NULLS .
CA constraint is enforced only for an INSERT operation on a table.
DYou can have more than one column in a table as part of a primary key.

How the community answered

(58 responses)

A
9% (5)
B
76% (44)
C
16% (9)

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