Thank you for the prompt reply!
I'm still running FUEL 1.3.2 and have been meaning to upgrade for a while, but it's just gone up in my priority list. I'm going to be using more queries like these, so the _common_joins method will certainly come in…
Thank you for the info, much appreciated!
I'll work on it today and report my findings, though I believe that helper function will solve my problem. Thanks again!