Which of the following SQL statements is not valid? a. SELECT isbn FROM books MINUS SELECT isbn
Question:
Which of the following SQL statements is not valid?
a. SELECT isbn
FROM books
MINUS
SELECT isbn
FROM orderitems;
b. SELECT isbn, name
FROM books, publisher
WHERE books.pubid (+) = publisher.pubid(+);
c. SELECT title, name
FROM books NATURAL JOIN publisher
d. All the above SQL statements are valid.
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