• Subject: Re: PF File Definition questions...
  • From: John P Carr <jpcarr@xxxxxxxxxxxx>
  • Date: Fri, 15 Oct 1999 10:39:05 -0400

Bruce Hoffman said
>One thing you should note, 1st normal form requires a physical file to have
>a primary key, a unique field that unambiguously identifies every single
>record in the file.

For that reason,  I always have the Unique key on the Phy.

If you do not have the unique key on the physical,  there are opportunities
where you could get 
dups.     (Oh,  I removed that LF's member so the reorg would run faster,  I
didn't think a user would sign on and add a record THAT quickly.........)

John Carr

| This is the Midrange System Mailing List!
| To submit a new message, send your mail to MIDRANGE-L@midrange.com.
| To subscribe to this list send email to MIDRANGE-L-SUB@midrange.com.
| To unsubscribe from this list send email to MIDRANGE-L-UNSUB@midrange.com.
| Questions should be directed to the list owner/operator: david@midrange.com

As an Amazon Associate we earn from qualifying purchases.

This thread ...

Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2022 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.