单选题
If a unique constraint is defined on column COL1 of table TAB1, what are the characteristics of COL1?（）
发布日期：2022-07-15
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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