Database management systems notes
ER Modelling
Turning a vague requirement into entities, attributes and relationships you can defend. Every section is a drawn page beside a clear written explanation, about 22 minutes in all.
- Chapter 4 of 34
- About 22 minutes
- 9 sections
Sign in with Google or GitHub and you land straight on this page. DSA comes with the all labs plan and every ChaiCode batch.
In this chapter
- Why model before you build
- Entities and entity sets
- The five kinds of attribute
- Relationships and degree
- Cardinality: one-to-one, one-to-many, many-to-many
- Participation: must it, or may it?
- Weak entities
- Extended ER: specialization, generalization, aggregation
- A complete worked diagram
Next chapters
Read the whole chapter
Sign in and the chapter opens with every drawn page, and all 35 database management systems chapters beside it.
DSA comes with the all labs plan and every ChaiCode batch.