Re: Sets and Lists, again

On 22 May 2006 17:49:21 -0700, "dawn" <dawnwolthuis_at_gmail.com> wrote:

>Gene Wirchenko wrote:
>> On 22 May 2006 16:42:22 -0700, "dawn" <dawnwolthuis_at_gmail.com> wrote:
>>
>> [snip]
>>
>> >I'm working at the logical level where an index holds the ordinal
>> >position. This position can be selected just as any attribute (derived
>> >or otherwise). There is no renumbering required.
>>
>> Indexes are physical, not logical.
>
>No. I am using the term as an index of an array. Array[n] where n is
>the index. If there is a list in a DBMS named emailAddresses, then the
>3rd element of that array is (logically) emailAddresses[2] (or [3],
>depending on the implementation of Arrays) and '2' (or '3') is the
>value of the index for that element.

     Since you are discussing implementation, it is physical.

Sincerely,

Gene wirchenko Received on Tue May 23 2006 - 18:53:34 CEST