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Which of the following is a valid SQL command? ( refer to the tables in the JustLee Books database).                                                                                      a. ALTER TABLE books ADD CONSTRAINT UNIQUE (pubid);                             b. ALTER TABLE books ADD CONSTRAINT PRIMARY KEY (pubid);                    c. ALTER TABLE books MODIFY (pubid CONSTRAINT NOT NULL);                    d. ALTER TABLE books ADD FOREIGN KEY CONSTRAINT (pubid) REFERENCES publisher (pubid);                                                                                                   e. None of the above commands is valid.

Which of the following is a valid SQL command? ( refer to the tables in the JustLee Books database).                                                                                      a. ALTER TABLE books ADD CONSTRAINT UNIQUE (pubid);                             b. ALTER TABLE books ADD CONSTRAINT PRIMARY KEY (pubid);                    c. ALTER TABLE books MODIFY (pubid CONSTRAINT NOT NULL);                    d. ALTER TABLE books ADD FOREIGN KEY CONSTRAINT (pubid) REFERENCES publisher (pubid);                                                                                                   e. None of the above commands is valid.

Oracle 12c: SQL
Oracle 12c: SQL
3rd Edition
ISBN:9781305251038
Author:Joan Casteel
Publisher:Joan Casteel
Chapter3: Table Creation And Management
Section: Chapter Questions
Problem 20MC
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Which of the following is a valid SQL command? ( refer to the tables in the JustLee Books database).                                                                                      a. ALTER TABLE books ADD CONSTRAINT UNIQUE (pubid);                             b. ALTER TABLE books ADD CONSTRAINT PRIMARY KEY (pubid);                    c. ALTER TABLE books MODIFY (pubid CONSTRAINT NOT NULL);                    d. ALTER TABLE books ADD FOREIGN KEY CONSTRAINT (pubid) REFERENCES publisher (pubid);                                                                                                   e. None of the above commands is valid.

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