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If a unique constraint is defined on column COL1 of table TAB1, what are the characteristics of COL1?()

发布日期:2020-04-10

If a unique constraint is defined on column COL1 o...
A

COL1 will accept NULL values and can be referenced in another table's foreign key specification.

B

COL1 will not accept NULL values and cannot be referenced in another tables foreign key specification.

C

COL1 will not accept NULL values and can be referenced in another tables foreign key specification.

D

COL1 will accept NULL values and cannot be referenced in another tables foreign key specification.

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