• Subject: Re: PF File Definition questions...
  • From: "R. Bruce Hoffman, Jr." <rbruceh@xxxxxxx>
  • Date: Fri, 15 Oct 1999 15:15:08 -0400

Ok, now I HAVE to disagree.

-----Original Message-----
From: Al Barsa, Jr. <barsa2@ibm.net>
To: MIDRANGE-L@midrange.com <MIDRANGE-L@midrange.com>
Date: Friday, October 15, 1999 2:33 PM
Subject: Re: PF File Definition questions...

>Most folks define PFs with keys, as this makes them easier to use.  SQL
>defines "tables" (PFs) without keys, and only defines "views" (LFs) with
>keys.  SQL is the industry standard for the definition of database files,
>which IMHO is inferior to DDS.

Not true. You have the option, just like in DDS, of creating a table with or
without the primary key. The key, when specified for the table, is part of
the physical file, just as if it was described by DDS.

CREATE TABLE collection.table (field1 char(10) primary key, field2 char(10))

This statement will create ONLY a physical file with a unique keyed access
path as part of the physical file, not as a separate logical file.

| 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.