Databases
Visual Representation
Collected by Laura Farinetti — Elmasri, R., & Navathe, S. B. (2015). Fundamentals of Database Systems. 7 ed. Addison-Wesley.
Conceptual modeling
Math
shows visually what is a relationship and that the instances of a relationship are connected to the instances of an entity
| Symbol | Concept |
|---|---|
| relationship | set |
| instance of a relationship | set element |
what an instance of a relationship is
Figure 3.9 - Some instances in the WORKS_FOR relationship set, which represents a relationship type WORKS_FOR between EMPLOYEE and DEPARTMENT.
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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.
