The setup is like this, I have 3 Taxomonies: Museum, Theme and Tour. Posts function as Objects which can be in multiple Themes and Tours but only in one Museum.
Now I would like to display a list of Themes from Museum 'A'. Since I can't have a relation between Themes and Museums I have to do it all through the posts. So how can I display only the Themes where its posts have a taxonomy label Theme and are in Museum 'A'?
I've googled quite a lot and since I'm not an expert in SQL Queries I thought I'd ask here and get an idea into the right direction