Syllabus Detail
- Data modelling using Chen's notation Entity Relationship (ER) diagrams.12 ATAR
Background
- in designing a database there are different ways to draw entities and relationships.
- Bachman used a crow's foot to show cardinality of a relationship.
- Chen uses a line or arrow to show cardinality.
- There are other differences as well, but for today we need understand that a standard must be followed.
- Which one do we use?
- Usually an organisation will choose one and stick to that.
Which one do we use for Computer Science in Western Australia
- Schools Curriculum and Standards Authority in Western Australia have dictated that we must Chen's Notation and have provided a handout to support this.
More detail about Chen's notation can be found at the wikipedia website.
Further Research
- Read more about Chen's notation on Wikipedia
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