1 EXPLAIN SELECT last name, first name, ROUND(AVG(length), 0) AS average FROM actor INNER JOIN film actor ON film actor actor id actor actor id INNER JOIN film ON film actor film id film film id WHERE title ALONE TRIP GROUP BY last name, first name ORDER BY average 2 EXPLAIN SELECT last name, first name, ROUND(AVG(length), 0) AS average FROM actor INNER JOIN film actor ON film actor actor id actor actor id INNER JOIN film ON film actor film id film film id WHERE title GROUP BY last name, first name ORDER BY average EXPLAIN SELECT last name, first name, ROUND(AVG(length), 0) AS average FROM actor INNER JOIN film actor ON film actor actor id actor actor id INNER JOIN film ON film actor film id film film id WHERE title 3 EXPLAIN SELECT last name, first name, ROUND(AVG(length), 0) AS average FROM actor INNER JOIN film actor ON film actor actor id actor actor id INNER JOIN film ON film actor film id film film id WHERE title ALONE TRIP GROUP BY last name, first name ORDER BY average 1 Text EXPLAIN result on data set with 30 films

Question

1  EXPLAIN SELECT last name, first name, ROUND(AVG(length), 0) AS average FROM actor INNER JOIN film actor ON film actor actor id   actor actor id INNER JOIN film ON film actor film id   film film id WHERE title    ALONE TRIP  GROUP BY last name, first name ORDER BY average  2  EXPLAIN SELECT last name, first name, ROUND(AVG(length), 0) AS average FROM actor INNER JOIN film actor ON film actor actor id   actor actor id INNER JOIN film ON film actor film id   film film id WHERE title GROUP BY last name, first name ORDER BY average  EXPLAIN SELECT last name, first name, ROUND(AVG(length), 0) AS average FROM actor INNER JOIN film actor ON film actor actor id   actor actor id INNER JOIN film ON film actor film id   film film id WHERE title 3  EXPLAIN SELECT last name, first name, ROUND(AVG(length), 0) AS average FROM actor INNER JOIN film actor ON film actor actor id   actor actor id INNER JOIN film ON film actor film id   film film id WHERE title    ALONE TRIP  GROUP BY last name, first name ORDER BY average  1 Text EXPLAIN result on data set with 30 films

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Question

1. EXPLAIN SELECT last_name, first_name, ROUND(AVG(length), 0) AS average FROM actor INNER JOIN film_actor ON film_actor.actor_id = actor.actor_id INNER JOIN film ON film_actor.film_id = film.film_id

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