relational database design
Overview
This lesson explores the fundamental principles of relational database design, focusing on how to structure data efficiently and effectively. We will cover the process of creating well-organised databases that minimise redundancy and ensure data integrity, which is crucial for robust software development.
Introduction to Relational Databases and Their Components
Relational databases are the most common type of database used today, organising data into one or more tables (relations) of rows and columns. Each table represents an 'entity' (e.g., Students, Courses, Orders). **Key Components:** * **Tables (Relations):** The fundamental building blocks, stori...
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Key Concepts
- Relational Database: A database that stores and provides access to data points that are related to one another through tables.
- Table (Relation): A collection of related data organised into rows (records) and columns (fields).
- Attribute (Field/Column): A single piece of information or characteristic that describes an entity in a table.
- Tuple (Record/Row): A single entry or instance of data in a table, representing a complete set of attributes for an entity.
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Exam Tips
- →Clearly define and differentiate between Primary Keys, Foreign Keys, and Candidate Keys. Provide examples to illustrate their roles.
- →Be prepared to draw and interpret Entity-Relationship (ER) diagrams, including correct notation for entities, attributes, relationships, and cardinalities.
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