Hello,

I need some hints on how to build a query on a data structure which turned out to be a hierarchy. Please find the picture of the EER diagram attached. I want to get all "note" entities for a given project with their corresponding project, shots and assets. Something like:
(project1, shot1, asset1, note1)
(project1, shot1, asset1, note2)
(project1, shot1, asset2, note1)

No problem with joins.

but I also want to get also:
(project1, None, None, note1)
(project1, Shot1, None, note1)

How is this possible with one query?

Cheers

Sebastian

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