Columns with null values are ignored by the UNIQUE constraint.
Correct Answer:
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Q3: Integrity constraints are always enforced,no matter what
Q4: You should use the NOT NULL constraint
Q5: A UNIQUE constraint is often used in
Q6: When you join tables together,you are nearly
Q7: Frequently,NOT NULL and CHECK constraints are not
Q9: Application constraints cannot be fine-tuned for each
Q10: Modifications to the database are affected by
Q11: A table can have more than one
Q12: The column or columns of a PRIMARY
Q13: A FOREIGN KEY constraint that is defined
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