[Year 12 IT Apps] questions itApps

[Mark KELLY]

A Reminder: if you want to start a new discussion thread, please don't start
it as a reply to an unrelated thread. It makes conversations hard to find
and follow  ;-)


On 22 November 2010 09:38, Townsley, Andrew A <
townsley.andrew.a at edumail.vic.gov.au> wrote:

> In the new book what are the questions at the end of Ch1?
> I have the old book and want students to complete the questions for Ch1 but
> I am not sure if they are the same as the old book?
>
>
> A.Townsley
> townsley.andrew.a at edumail.vic.gov.au
> Fountain Gate SC
>
>
>
> -----Original Message-----
> From: itapps-bounces at edulists.com.au on behalf of Mark KELLY
> Sent: Mon 22/11/2010 9:23 AM
> To: Year 12 IT Applications Teachers' Mailing List
> Subject: [Year 12 IT Apps] Logical and physical data dictionaries
>
> Hi all.  I've flipped and flopped over the years about whether I thought
> data dictionaries were logical or physical design tools.  On one page on my
> Lecture Notes I had them as logical, on another page they were physical.
> Now
> I've a sneaking suspicion that *both* are right: there are logical data
> dictionaries and physical data dictionaries...
>
> To quote
>
> http://www.modernanalyst.com/Careers/InterviewQuestions/tabid/128/articleType/ArticleView/articleId/1392/categoryId/45/What-is-a-logical-data-dictionary-and-what-are-the-benefits-of-maintaining-one.aspx
>
> *"At a logical level, the business representative cares about questions
> such
> as:
>
> What is a Sales Contract?
> What are the primary elements of a Sales Contract?
> Do these primary elements have attributes or data of their own?
> How does a Sales Contract relate to other relevant business entities?
>
> Once data has been logically defined, the definition and relationships
> between various pieces of logical data rarely need to change.
> In contrast, a physical data dictionary allows an organization to describe
> data in terms of its physical data structure, type, format, and length.
> Physical data dictionaries provide programmers of many different systems
> with a tool to understand how and where the data is stored and how it must
> be referenced in order to consume it."*
>
> Has anyone else discovered these 2 varieties of data dictionaries?
>
> --
> Mark Kelly
>
>

-- 
Mark Kelly
Moderator: IT Applications Edulist
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