Which of the following is not a valid SELECT statement? a. SELECT STDDEV (retail) FROM books; b.
Question:
Which of the following is not a valid SELECT statement?
a. SELECT STDDEV (retail)
FROM books;
b. SELECT AVG (SUM (retail))
FROM orders
NATURAL JOIN orderitems NATURAL JOIN books
GROUP BY customer#;
c. SELECT order#, TO_CHAR (SUM (retail), '999.99')
FROM orderitems JOIN books USING (isbn)
GROUP BY order#;
d. SELECT title, VARIANCE (retail-cost)
FROM books
GROUP BY pubid;
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