Which of the following is a valid SELECT statement? a. SELECT AVG (retail-cost) FROM books GROUP BY
Question:
Which of the following is a valid SELECT statement?
a. SELECT AVG (retail-cost)
FROM books
GROUP BY category;
b. SELECT category, AVG (retail-cost)
FROM books;
c. SELECT category, AVG (retail-cost)
FROM books
WHERE AVG (retail-cost) > 8.56
GROUP BY category;
d. SELECT category, AVG (retail-cost) Profit
FROM books
GROUP BY category
HAVING profit > 8.56;
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