​Structure of the PROMOTION Table

question 16

Multiple Choice

​Structure of the PROMOTION table

-Which of the following commands will add a UNIQUE constraint to the MINRETAIL column of the PROMOTION table?​

• A) ALTER TABLE promotion ADD CONSTRAINT orderitems_minretail_uk UNIQUE (minretail);
• B) ALTER TABLE promotion MODIFY UNIQUE (minretail);
• C) ALTER TABLE promotion ADD UNIQUE minretail;
• D) ​ALTER TABLE promotion MODIFY minretail;

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