php - 如何在此查询中使用 LEFT JOIN

Question

我有以下查询

SELECT
    interview_content.title `title`,
    gallery_images.img_path img
FROM
    `interview`,
    `interview_content`,
    `gallery`,
    `gallery_images`
WHERE
    `gallery_images`.`id_parrent` = `gallery`.`id`
AND
    `gallery`.`id` =  `interview`.`gallery_id`
AND
    `gallery_images`.`default` = '1'
AND
    `interview`.`id` = `interview_content`.`id_parrent`
AND
    interview_content.id_lang = '2'
ORDER BY
    interview.date DESC

我需要在 gallery、gallery_images 表上使用 LEFT JOIN(即使没有 gallery 也能获得 interview.title或默认图像)

非常感谢

更新

---

问题出在第二个 LEFT JOIN 中。我无法让它们一起正常工作。当我尝试

SELECT
    interview_content.title `title`,
    gi.img_path img
FROM
    `interview`,
    `interview_content`
LEFT JOIN `gallery` as g ON g.`id` = `interview`.`gallery_id` 
LEFT JOIN `gallery_images` as gi ON gi.id_parrent = g.`id`
WHERE
    `interview`.`id` = `interview_content`.`id_parrent`
AND
    interview_content.id_lang = '2'
ORDER BY
    interview.date DESC

it returns //Unknown column 'interview.gallery_id' in 'on clause'

Answer 1

你知道你需要做什么。 Google 是你的 friend 吗？

http://en.wikipedia.org/wiki/Join_%28SQL%29#Left_outer_join