Review Questions

1.What is E-R modelling? How is it different than SQL?
2.Discuss the basic concepts of E-R model.
3.What are the semantic concepts of E-R model?
4.What do you understand by an entity? What is an entity set? What are the different types of entity type? Explain the concept using semantic net.
5.When is the concept of weak entity used in the data modelling?
6.What do you understand by a relationship? What is the difference between relationship and relationship occurrence?
7.What is a relationship type? Explain the differences between a relationship type, a relationship instance and a relationship set.
8.Explain with diagrammatical illustrations about the different types of relationships.
9.What do you understand by degree of relationship? ...

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