Given the following query: SELECT DISTINCT zip, category FROM customers NATURAL JOIN orders NATURAL JOIN orderitems NATURAL
Question:
Given the following query:
SELECT DISTINCT zip, category
FROM customers NATURAL JOIN orders NATURAL JOIN orderitems
NATURAL JOIN books;
Which of the following queries is equivalent?
a. SELECT zip FROM customers
UNION
SELECT category FROM books;
b. SELECT DISTINCT zip, category
FROM customers c, orders o, orderitems oi, books b
WHERE c.customer# = o.customer# AND o.order# = oi.order#
AND oi.isbn = b.isbn;
c. SELECT DISTINCT zip, category
FROM customers c JOIN orders o
JOIN orderitems oi JOIN books b
ON c.customer# = o.customer#
AND o.order# = oi.order#
AND oi.isbn = b.isbn;
d. All of the above
e. None of the above
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