Mastering Relational Database Design

📋 Course Outline

1. Relational Database Model
2. Tables and Keys
3. Relationships Types
4. Database Design Principles
5. Normalization and Denormalization
6. SQL Commands
7. Joins and Aggregates
8. Data Integrity Constraints
9. Transactions and ACID
10. Concurrency Control
11. Real-World Applications
12. Exam Preparation Tips

📖 1. Relational Database Model

🔑 Key Concepts & Definitions

• Table (Relation): A collection of data organized into rows (records) and columns (attributes). Each table represents an entity or relationship within the database.

• Primary Key: A unique identifier for each record within a table, ensuring entity integrity. Example: CustomerID in a Customers table.

• Foreign Key: A field (or set of fields) in one table that references the primary key in another table, establishing a relationship between the two tables.

• Relationship Types:

  • One-to-One: Each record in Table A relates to one record in Table B.
  • One-to-Many: A record in Table A can relate to multiple records in Table B.
  • Many-to-Many: Multiple records in Table A relate to multiple records in Table B, often implemented via junction tables.

• Normalization: The process of organizing data to reduce redundancy and dependency by dividing data into related tables, following normal forms (1NF, 2NF, 3NF).