You wouldn't happen to have a spare ELH diagram (or two) lying around that one could take a look at, would you?
Thanks. TIM -When you save for a long time to buy something, then you find that you can't afford it --- that's inflation. > -----Original Message----- > From: DL Neil [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, January 09, 2002 7:23 AM > To: George Pitcher; [EMAIL PROTECTED] > Subject: Re: [PHP-DB] Concept help required > =The purpose of an ELH diagram is to take a piece of data > (in your case, because we are assuming/checking > normalisation, I'd 'cheat' and work at the table level - > rather than something more atomic like the data-item > level). Once again we draw boxes (I have some wonderful s/w > for doing these tasks, but it is M$). A single > label/box at the top, featuring the name of the data-unit, > and I would guess a minimum of three (must be my > favorite number!) boxes in the next row, representing the > arrival/creation of the data, its use within the > system, and the removal of the data from the system once > its usefulness has subsided, respectively. The third > row of boxes represents the actual, individual events in > the life-cycle/daily operation of the system, and how > they alter/update/use the data. Lines drawn between the > boxes show how these events relate and where there may > be some iteration. -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
