A database offers an organized mechanism for storing, managing and retrieving information.
Data is organized into rows, columns and tables, and it is indexed to make it easier to find
relevant information. Data gets updated, expanded and deleted as new information is added.
Here some notes:
- Introduction to databases
- Conceptual database design
- Logical database design
- Physical database design
A quick overview about the history of trigonometry:
Combinatorics and Probability
A presentation on elements of combinatorics and probability: