Which of the following is not a valid SELECT statement?a. SELECT STDDEV(retail)FROM books;b. SELECT AVG(SUM(retail))FROM ordersNATURAL JOIN orderitems NATURAL JOIN booksGROUP 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 booksGROUP BY pubid;
Which of the following is not a valid SELECT statement?a. SELECT STDDEV(retail)FROM books;b. SELECT AVG(SUM(retail))FROM ordersNATURAL JOIN orderitems NATURAL JOIN booksGROUP 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 booksGROUP BY pubid;
Chapter11: Group Functions
Section: Chapter Questions
Problem 20MC
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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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