Home » IBM » C2090-610 » Which type of constraint can be used to ensure that an INTEGER column in a table will never be assigned more than one record that contains a NULL value?
Which type of constraint can be used to ensure that an INTEGER column in a table will never be assigned more than one record that contains a NULL value?
A. Unique constraint
B. Primary key constraint
C. Informational constraint
D. Column default constraint
Correct Answer: A
Explanation/Reference:
Explanation:
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