On Aug 13, 2014, at 3:43 AM, Keith Medcalf <kmedc...@dessus.com> wrote:

> I don't think you want max() around collections.book_in_date.  You want the 
> max(collection_date) but the book_in_date from that row.  Since the 
> collection_date is unique, the book_in_date can only come from one record.

Possibly. Surely the OP knows her data. On the other hand, this being an 
aggregation, every keys must be accounted for. 

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