DB : heroku pg:psql --app server-article-reader-api \d : show table
CREATE TABLE category ( id SERIAL PRIMARY KEY, name VARCHAR(100) NOT NULL );
SELECT film.film_id, film.title, inventory_id FROM film LEFT JOIN inventory ON inventory.film_id = film.film_id WHERE inventory.film_id IS NULL;
SELECT categories.name FROM articles_categories LEFT JOIN categories ON articles_categories.id = categories.id WHERE articles_categories.articleid = 1
2 3 ALTER TABLE articles ADD COLUMN title VARCHAR(100),
ALTER TABLE articles ALTER COLUMN title SET DEFAULT 'Untitled'