Well to answer the question in the subject line, I wrote this a little while back: http://www.spacevatican.org/2008/6/22/the-difference-between-include-and-joins A key thing to note is that include in 2.1 and include in 2.0.2 are different (but the 2.1 code will fall back to the 2.0.2 code if necessary). Does the companies table not have columns called ref_company_id ?
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