[Year 12 SofDev] ER diagrams v data structure diagrams for 2011

[Claudia Graham]

Hi all,
I've pulled out a discussion point we had at the end of the year about the differences between 'data structure diagrams' and 'ER diagram', needed for Outcome 2
And as Mark K rightly pointed out during this discuaaion there does not seem to be a 'standard' as such, and I have resorted to 'Wikipedia' as the source of knowledge. I have even gone back to old Uni books with no luck. Lots of talk on 'data modelling' and then using ER diagrams to do it but trying to find a definition as such to start putting some notes together.
Has anyone been able to source something or are we going with a data structure diagram that 'highly resembles' an ER diagram? Because ER diagram are one data structure diagram method, I think.
I did find this mind map as I was searching this evening, which visually at least cleared a few things up (if it is in fact an accurate mind map) (note: each of the green arrow will make that term the centre of the mind map)
http://en.domotica.net//Data_structure_diagram<http://en.domotica.net/Data_structure_diagram>

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Regards
Claudia
*********************************************************************
Claudia Graham
VCE Coordinator
9334 0049 (direct)



From: sofdev-bounces at edulists.com.au [mailto:sofdev-bounces at edulists.com.au] On Behalf Of Alex Galle
Sent: Thursday, 4 November 2010 4:12 PM
To: 'Year 12 Software Development Teachers' Mailing List'
Subject: Re: [Year 12 SofDev] ER diagrams v data structure diagrams for 2011

Hi All
Going back into a past life an ER diagram was simply created to establish the entities and relationships that exist in what would become a relational database. No detail was required with respect to each entity other than a name. The DSD on the other hand identified all of the fields within each entity, the key field/fields. The relationships were indentified as being one to one, one to many etc ensuring that the model created was indeed relational and that a working RDB could be created.
I will go through my old resources to see if what I used is still available. If successful I will pass the details on to the list.
Regards
Alex Galle

From: sofdev-bounces at edulists.com.au [mailto:sofdev-bounces at edulists.com.au] On Behalf Of Margaret Iaquinto
Sent: Thursday, 4 November 2010 11:39 AM
To: sofdev at edulists.com.au
Subject: [Year 12 SofDev] ER diagrams v data structure diagrams for 2011

In the study design for 2011, a KK includes data structure diagrams and ER diagrams. Looking on the Web for some help, it appears they are similar and perform similar functions. Perhaps the ER diagram is a subset of the data structure diagram. Haven't fully grasped this yet.

ER diagrams are found in ITA in 2011.

So, can someone supply a way to differentiate the two? Or even websites for examples?

thanks

Maggie


Margaret Iaquinto
Information Technology Coordinator

St Leonard's College
Brighton Campus
t (+61 3) 9909 9300

x 529

www.stleonards.vic.edu.au<http://www.stleonards.vic.edu.au/>

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Alternate email: maggie at iaquinto.net<mailto:maggie at iaquinto.net>

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