# Erm Lecture Notes

Submitted By HurryUpGemma
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Slide 4
Top-Down Technique:
 Starts at general top level and adds more detail as we go through the process.
 Trying to capture a 'picture' of the underlying and stable information on which an organisation and its I.S. (Information Systems) are based; known as a high level data model.
Conceptual Model:
 General, non-specific and is concerned with the 'logical' nature of the data, and 'what' is being represented.
 It holds no physical details and is therefore independent of its final implementation ( not interested in ''how' the data will be represented ).
 We can think of it as data analysis in the abstract. It 'models' the data structures of a system.
Slide 5
Iterative process:
 We may need to make several versions of the diagram, checking it against the user requirements and refining it until it is correct.
Slide 10
Note: attributes on the ERM diagram.
We do not normally include all the attributes, for a given entity, on the ERM diagram. This is to ensure that the ERM is clear and concise; too many attributes could lead to confusion.
We tend to only show them if they add important information to the diagram, or clarify a problem.
My advice is to only include 'key' fields.
Slide 17
In the original CHEN notation, the description (verbs) of the relationship is placed inside a
'diamond'...
Example:
[ relationship between A+B] s Entity Entity
Note: in the lectures we use an alternative; just place a 'label' on the line...
“x”
A
“x”
B
A B
Slide 19
Note, with 1:1 relationships
Always make further analysis!
What can happen is that one of the entities could actually be just an attribute of the other, or it may indicate a '1:m' relationship over time.
Example:
A department may have many managers during its lifetime; a manager may also be in charge of different departments during his/her career.
You would have to decide whether...

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