CREATE TABLE film_text (film_id NUMBER, title CLOB, description CLOB)
CREATE TABLE staff (staff_id NUMBER, first_name CLOB, last_name CLOB, address_id NUMBER, picture others, email CLOB, store_id NUMBER, active BOOLEAN, username CLOB, password CLOB, last_update TIME)
CREATE TABLE country (country_id NUMBER, country CLOB, last_update TIME)
CREATE TABLE store (store_id NUMBER, manager_staff_id NUMBER, address_id NUMBER, last_update TIME)
CREATE TABLE inventory (inventory_id NUMBER, film_id NUMBER, store_id NUMBER, last_update TIME)
CREATE TABLE customer (customer_id NUMBER, store_id NUMBER, first_name CLOB, last_name CLOB, email CLOB, address_id NUMBER, active BOOLEAN, create_date TIME, last_update TIME)
CREATE TABLE address (address_id NUMBER, address CLOB, address2 CLOB, district CLOB, city_id NUMBER, postal_code CLOB, phone CLOB, last_update TIME)
CREATE TABLE category (category_id NUMBER, name CLOB, last_update TIME)
CREATE TABLE film (film_id NUMBER, title CLOB, description CLOB, release_year TIME, language_id NUMBER, original_language_id NUMBER, rental_duration NUMBER, rental_rate NUMBER, length NUMBER, replacement_cost NUMBER, rating CLOB, special_features CLOB, last_update TIME)
CREATE TABLE language (language_id NUMBER, name CLOB, last_update TIME)
CREATE TABLE city (city_id NUMBER, city CLOB, country_id NUMBER, last_update TIME)
CREATE TABLE payment (payment_id NUMBER, customer_id NUMBER, staff_id NUMBER, rental_id NUMBER, amount NUMBER, payment_date TIME, last_update TIME)
CREATE TABLE film_actor (actor_id NUMBER, film_id NUMBER, last_update TIME)
CREATE TABLE actor (actor_id NUMBER, first_name CLOB, last_name CLOB, last_update TIME)
CREATE TABLE film_category (film_id NUMBER, category_id NUMBER, last_update TIME)
CREATE TABLE rental (rental_id NUMBER, rental_date TIME, inventory_id NUMBER, customer_id NUMBER, return_date TIME, staff_id NUMBER, last_update TIME)

Return the first names of customers who did not rented a film after the date '2005-08-23 02:06:01'.
SELECT first_name FROM customer WHERE NOT customer_id IN (SELECT customer_id FROM rental WHERE rental_date > '2005-08-23 02:06:01')
SELECT "first_name" FROM "customer" WHERE NOT "customer_id" IN (SELECT "customer_id" FROM "rental" WHERE "rental_date" > '2005-08-23 02:06:01')