I have received this book and am trying to learn APEX... I have restarted 8 times and still can not get past chapter 4... I an stuck at the 'Calculation' section. The query that the book shows, page 94, is not the query that I display in app, then I try to make it like the book and receive errors... Plus I am a little taken back by page 42 and 43... since the instruction on #10 does not match the completed screen shot on page 43. I want to know which is the correct. I am so sorry for this but I am about to pull all my hair out!!! Can someone please help me.. Thank you very much..