Fix JOIN query for DVDrental database using AI

The provided SQL statement has a few issues that need to be corrected. Here's a step-by-step breakdown of the issues and the corrected SQL statement:

1. There are typos in the column aliases and table aliases (e.g., actor_ida, first_name1, film_actora).
2. The FROM clause has a trailing comma that should be removed.
3. The WHERE clause has a typo in IS NUL which should be IS NULL.
4. The DATE_SUB function is missing a space before the opening parenthesis.
5. The GROUP BY clause should match the selected columns exactly, including the aliases.

Here is the corrected SQL statement:

            

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            SELECT
  a.actor_id,
  a.first_name,
  a.last_name
FROM
  actor a
  LEFT JOIN film_actor fa ON a.actor_id = fa.actor_id
  LEFT JOIN inventory i ON fa.film_id = i.film_id
  LEFT JOIN rental r ON i.inventory_id = r.inventory_id
WHERE
  r.rental_date IS NULL
  OR r.rental_date < DATE_SUB (NOW (), INTERVAL 1 YEAR)
GROUP BY
  a.actor_id,
  a.first_name,
  a.last_name;
          

Note that I've also corrected the join condition from fa.film_id = r.inventory_id to fa.film_id = i.film_id and i.inventory_id = r.inventory_id because film_actor.film_id should be joined with inventory.film_id, and rental.inventory_id should be joined with inventory.inventory_id based on the provided table schema.