Databases
Database Analogies
Collected by Giovanna Guerrini — Textbook Garcia-Molina, H., Ullman, J. D., & Widom, J. (2009). Database Systems: The Complete Book (2nd ed.). Prentice Hall Press, Upper Saddle River, NJ, USA.
Conceptual modeling
Computer Science (except DB)
Stresses the similarity with object oriented programming languages
| Symbol | Concept |
|---|---|
| entity | object |
| set of entities | class |
The fact that entities have common properties
An entity in some ways resembles an “object” in the sense of object-oriented programming, likeways an entity set resembles a class of objects.
There is a significant resemblance between “isa” in the E/R model and subclasses in object-oriented languages
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A notional machine is a pedagogic device to assist the understanding of some aspect of programs or programming. To something along the lines of A notional machine is a pedagogical tool designed to support the understanding of programs, programming, and other aspects of computing such as databases.
