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Which of the following SQL statements is invalid and returns an error message? ( refer to the tables in the JustLee Books database). a. ALTER TABLE books ADD CONSTRAINT books_pubid_uk UNIQUE (pubid);  b. ALTER TABLE books ADD CONSTRAINT books_pubid_pk PRIMARY KEY (pubid);                                                                                                                c. ALTER TABLE books ADD CONSTRAINT books_pubid_nn NOT NULL (pubid); d. ALTER TABLE books ADD CONSTRAINT books_pubid_fk FOREIGN KEY (pubid) REFERENCES publisher (pubid); e. All of the above statements are invalid

Which of the following SQL statements is invalid and returns an error message? ( refer to the tables in the JustLee Books database). a. ALTER TABLE books ADD CONSTRAINT books_pubid_uk UNIQUE (pubid);  b. ALTER TABLE books ADD CONSTRAINT books_pubid_pk PRIMARY KEY (pubid);                                                                                                                c. ALTER TABLE books ADD CONSTRAINT books_pubid_nn NOT NULL (pubid); d. ALTER TABLE books ADD CONSTRAINT books_pubid_fk FOREIGN KEY (pubid) REFERENCES publisher (pubid); e. All of the above statements are invalid

Oracle 12c: SQL
Oracle 12c: SQL
3rd Edition
ISBN:9781305251038
Author:Joan Casteel
Publisher:Joan Casteel
Chapter4: Constraints
Section: Chapter Questions
Problem 3MC: Which of the following SQL statements is invalid and returns an error message? ALTER TABLE books ADD...
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Which of the following SQL statements is invalid and returns an error message? ( refer to the tables in the JustLee Books database).

a. ALTER TABLE books ADD CONSTRAINT books_pubid_uk UNIQUE (pubid);  b. ALTER TABLE books ADD CONSTRAINT books_pubid_pk PRIMARY KEY (pubid);                                                                                                                c. ALTER TABLE books ADD CONSTRAINT books_pubid_nn NOT NULL (pubid); d. ALTER TABLE books ADD CONSTRAINT books_pubid_fk FOREIGN KEY (pubid) REFERENCES publisher (pubid); e. All of the above statements are invalid

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