2 queries ? nooooo

subselect - way, 1 query.

db(db.news_categories.id.belongs(db(db.news.id>0)._select(db.news.category, 
distinct=True))).select()

technically, there is also another one, more useful in case you'd like to 
select, e.g., only categories with at least x news, but that's another 
story.

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