OUTER JOIN和多个表出现问题

Question

I have the following SQL, which works:

SELECT QuizFamilies.ID, QuizFamilies.Title
FROM QuizFamilies
LEFT OUTER JOIN Images ON QuizFamilies.ID = Images.ID

Now, I need to add an additional table (ImageData) to the outer join. (where Images.ID = ImageData.ID) in order to retrieve the column I need from it: ImagesData.Uri

I've tried all sorts of inner and outer combinations, but can't get it to work.

Answer 1

Just add another join:

SELECT QuizFamilies.ID, QuizFamilies.Title, ImageData.URI
FROM QuizFamilies
LEFT OUTER JOIN Images ON QuizFamilies.ID = Images.ID
LEFT OUTER JOIN ImageData on ImageData.ID = Images.ID