Group similar results, listing users
I'd like to group similar results, but list all of the users who've added the same data.
Just to explain, I have two tables:
1. a table for the bookmarks, containing the URI by which I'd be grouping, and;
2. a table for the users and bookmark IDs, linking users to bookmarks.
I know how to group by the URI, but not how to pull through the names of all of the users who added the same bookmark.
Maybe this would have to happen within PHP? Right now, I don't know what would be quicker — which is why I'm here, asking you guys!