How to use the finder when joining tables?

[Orit]

How should I use the XF finder with an sql query left joining 3 tables (I can join only 2 of them if it's simpler...)?

I'm working on adding API endpoints to an existing add-on (I've already succeeded in doing it for another add-on)
but have had a problem:

I have 3 tables. One has events, the 2nd has event categories (id and titles) and the 3rd links between the categories and the events.
I'm trying to combine them into a XF finder, to display the category titles beside each event.
How...

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How to use the finder when joining tables?

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