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Which two statements are true about constraints? ()

发布日期:2022-06-26

Which two statements are true about constraints? (...
A

The UNIQUE constraint does not permit a null value for the column.

B

A UNIQUE index gets created for columns with PRIMARY KEY and UNIQUE constraints.

C

The PRIMARY KEY and FOREIGN KEY constraints create a UNIQUE index.

D

The NOT NULL constraint ensures that null values are not permitted for the column.

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此试题出现在

Oracle认证考试

1Z0-007

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