Oracle Database SQL 12c 1z0-071 Exam Practice Test 2

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Question : 36 of 50

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Which two statements are true regarding constraints?

A foreign key column cannot contain null values.
A column with the UNIQUE constraint can contain null values.
A constraint is enforced only for INSERT operation on the table.
A constraint can be disabled even if the constraint column contains data.
All constraints can be defined at the column level and at the table level.

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