Databases
Visual Representation
Collected by Xiaoying Tu — Date, C. J. (2003). An Introduction to Database Systems. 8 ed. Pearson.
Query languages (basic)
Visualizes the relational algebra operators, in particular visualizing what result they produce
| Symbol | Concept |
|---|---|
| the table-looking rectangles | the input relations |
| the shaded area | the output |
results of the eight algebra operators
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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.
