You've got a little defensive there and having re-read what I wrote I can see why. I hadn't intended what I wrote to sound like I was accusing you of not paying attention, I simply wanted to draw your attention to the fact that the logic behind the idea is identical in both your previous question and your new question. As Chris explained (far better than I), the difference in the structure of the query is to accommodate the changes to the schema that you supplied with your question.