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My attempt at challenge#8.
I would agree with earlier posts, that the requirement to " Identify the ... tickets since June 2013" is misleading, as the solution is from 1st July 2013 onwards. Although a simple fix when you've finished, wonder where you've gone wrong, then look at the solution.
Also, I thought the solution using a cross-tab for a beginners challenge is a bit harsh! Even the training says they are very difficult to use. I initially tried to use a cross-tab, revisited the training twice, could not get it to work. So I gave up with the cross-tab, and opted for a different approach.
I thought the approach in the solution to include a second lookup file to handle the "burger or pizza" issue was not a clean solution. But I guess it shows there are a million ways to solve these problems!