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​Structure of the ORDERITEMS Table

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​Structure of the ORDERITEMS table
​Structure of the ORDERITEMS table    -Based on the structure of the ORDERITEMS table,which of the following commands will make certain that the ISBN entered actually exists in the ISBN column of the BOOKS table?​ A)  ALTER TABLE orderitems ADD FOREIGN KEY isbn REFERENCES BOOKS TABLE (isbn) ; B)  ALTER TABLE orderitems MODIFY FOREIGN KEY (isbn) REFERENCES books(isbn) ; C)  ALTER TABLE orderitems CREATE FOREIGN KEY (isbn) REFERENCES books(isbn) ; D)  ​ALTER TABLE orderitems ADD FOREIGN KEY (isbn) REFERENCES books(isbn) ;
-Based on the structure of the ORDERITEMS table,which of the following commands will make certain that the ISBN entered actually exists in the ISBN column of the BOOKS table?​

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