Hey all - I have a table listing references for chapters in a book. I'm trying to find all the cases where a single chapter lists more than one reference from the same author. In this example table, I want it to find IDs 1 and 2, because they're both from the same author, and both in chapter 1 of the book. It should not return ID 4, because that's in a different chapter.
Note that J. and John have to be considered the same. For my purposes, it's sufficient to look at the first word, Smith, and consider that a duplicate. +----+--------------+---------+ | ID | Author | Chapter | +----+--------------+---------+ | 1 | Smith, John | 1 | | 2 | Smith, J. | 1 | | 3 | Williams, B. | 1 | | 4 | Smith, John | 2 | +----+--------------+---------+ I haven't been able to even get a start on this. Any suggestions? - Brian
