What is the average length of movies in each category? 2 decimals.

SQL Statement for Postgres:

SELECT
  c.name AS category,
  ROUND(AVG(f.length), 2) AS average_length
FROM
  film f
  JOIN film_category fc ON f.film_id = fc.film_id
  JOIN category c ON fc.category_id = c.category_id
GROUP BY
  c.name;

Explanation:

• The SQL statement uses the film, film_category, and category tables to calculate the average length of movies in each category.
• The JOIN keyword is used to combine the tables based on their respective foreign key relationships.
• The GROUP BY clause is used to group the results by the category name.
• The AVG function is used to calculate the average length of movies in each category.
• The ROUND function is used to round the average length to 2 decimal places.
• The result will include the category name and the average length of movies in that category.