On Wed, 20 Jun 2007, Martijn van Oosterhout wrote:
While true in this simple case, it can quickly become more complicated if your relationship starts gaining attributes. For example, if you add start and stop dates, so the (player,club) combination is not unique anymore. If you track invoices, games or scores it may be easier to reference the relatioship via a surrogate key rather than copying the other IDs around everywhere.
That's very true, Martijn. It did not seem to be the case in the original post. When you add a time history and need to identify a player's team at a specified point in time, it gets much more complicated. That's when reading Rick Snodgrass' book helps a lot. Rich -- Richard B. Shepard, Ph.D. | The Environmental Permitting Applied Ecosystem Services, Inc. | Accelerator(TM) <http://www.appl-ecosys.com> Voice: 503-667-4517 Fax: 503-667-8863 ---------------------------(end of broadcast)--------------------------- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
