My scenario: There are 3 tables for storing tv show information; season, episode and episode_translation.
My data: There are 3 seasons, with 3 episodes each one, but there is only translation for one episode.
My objetive: I want to get a list of all the seasons and episodes for a show. If there is a translation available in a specified language, show it, otherwise show null.
My attempt to get serie 1 information in language 1:
SELECT
season_number AS season,number AS episode,name
FROM
season NATURAL JOIN episode
NATURAL LEFT JOIN episode_trans
WHERE
id_serie=1 AND
id_lang=1
ORDER BY
season_number,number
result:
+--------+---------+--------------------------------+
| season | episode | name |
+--------+---------+--------------------------------+
| 3 | 3 | Episode translated into lang 1 |
+--------+---------+--------------------------------+
expected result
+-----------------+--------------------------------+
| season | episode| name |
+-----------------+--------------------------------+
| 1 | 1 | NULL |
| 1 | 2 | NULL |
| 1 | 3 | NULL |
| 2 | 1 | NULL |
| 2 | 2 | NULL |
| 2 | 3 | NULL |
| 3 | 1 | NULL |
| 3 | 2 | NULL |
| 3 | 3 | Episode translated into lang 1 |
+--------+--------+--------------------------------+
Full DB dump
http://pastebin.com/Y8yXNHrH
