I found this lesson a bit confusing. As someone who is just trying to learn the ideas and concepts, not build a database specifically for a sales company, I had trouble following along with this particular lesson. A bit more explanation of what the goal was and what was being accomplished as the video progressed would have been appreciated.

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Reply from Richard Rost:

I can appreciate that. Not everyone will find each lesson useful. You may never have a need for an aggregate query, or to sum up monthly sales total. However, being exposed to the material may cause you to realize later that you CAN accomplish one of your goals by using these things. Sometimes just exposure to a topic can increase your awareness of what CAN be done. Sometimes you don't know WHAT you don't know. :)