Базовый SQL-материал ... Left Join

Question

Я новичок в SQL. Это не вернуло никаких результатов .....

SELECT media.id as mediaid, media.title as mediatitle, 
  media.description as mediadescription, media.date as mediadate, 
  media.duration, media.price as mediaprice, media.thumburl as thumburl, 
  presenters.f_name as firstname, presenters.l_name as lastname, 
  presenters.credentials 
FROM `media` 
WHERE media.title = 'Code of Ethical Conduct' 
LEFT JOIN `presenters` ON presenters.fkMediaID = media.id

Но до того, как я добавил часть докладчика, она работала просто отлично ...

SELECT media.id as mediaid, media.title as mediatitle, 
  media.description as mediadescription, media.date as mediadate, 
  media.duration, media.price as mediaprice, media.thumburl as thumburl 
FROM `media` 
WHERE media.title = 'Code of Ethical Conduct'

Есть идеи почему?

Answer 1

Предложение WHERE остается последним

Так что это было бы ИЗ СМИ ОСТАЛОСЬ ВЕДУЩИМИ Ведущими .....

ГДЕ media.title ....

Answer 2

Часть LEFT JOIN должна быть перед частью WHERE.

SELECT media.id as mediaid, media.title as mediatitle,
    media.description as mediadescription, media.date as mediadate,
    media.duration, media.price as mediaprice, media.thumburl as thumburl,
    presenters.f_name as firstname, presenters.l_name as lastname,
    presenters.credentials
FROM media
LEFT JOIN presenters ON presenters.fkMediaID = media.id
WHERE media.title = 'Code of Ethical Conduct'