Question: Which of the following SQL statements is not valid? a. SELECT TO_CHAR (orderdate, '99/9999') FROM orders; b. SELECT INITCAP (firstname), UPPER (lastname) FROM customers; c.

Which of the following SQL statements is not valid?

a. SELECT TO_CHAR (orderdate, '99/9999')

FROM orders;

b. SELECT INITCAP (firstname), UPPER (lastname)

FROM customers;

c. SELECT cost, retail,

TO_CHAR(retail-cost, '$999.99') profit

FROM books;

d. All of the above

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