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java-filmorate's Introduction

ER diagram

Для реализации зависимости многие ко многим использованы три дополнительные таблицы:

  • friends - для связи пользователей и статуса дружбы с другими пользователями
  • film_user - для связи лайков пользователей фильмам
  • film-category - для связи фильмов с категориями
  1. Find all user friends:

    SELECT friend_id
    FROM friends
    WHERE user_id=?;
  1. Find first 10 most popular films:

    SELECT f.name AS film,
    COUNT(fu.user_id) AS popularity
    FROM films AS f
    LEFT JOIN film_user AS fu ON f.id=fu.film_id
    GROUP BY film
    ORDER BY popularity DESC
    LIMIT 10;

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