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1. Which requirements can be implemented using a referential integrity constraint?

Ans : Customer information must be known before anything is sold to him/her

2. Which of the following statements are TRUE? [Choose any TWO]

Ans : A Unique constraint allows multiple rows to have NULL value
Referential integrity constraint allows NULL value

3. Which requirements can be implemented using a CHECK constraint? [Choose any TWO]

Ans : Age of the customer must be greater than 21
Customer must have a residence in an Asian Country

4. Which is the constraint that can be defined only at the column level?

Ans : NOT NULL

Under DDL Statements/Quiz - Constraints and Create table.rtf,I believe it should be txt like all other files.