swcarpentry/bc — pull request #790 by iglpdc (2014-10-08 20:14:51+00:00)
Title: Remove duplicate challenge in the second notebook of the novice SQL lesson

The challenge appears twice, once in the middle of the lesson, and again at the end. Furthermore, the one in the middle mentions the wrong table for the exercise (should be "Visited" instead of "Site"). The one in the middle is removed, to be consistent with the rest of the lessons, where challenges appear always at the end.