Intro to Relational Databases and Relational Theory
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This document provides an introduction to relational databases. It discusses how data has relationships and provides an example of an ecommerce database with customer, order, and product tables connected by primary and foreign keys. The customer table lists customers with an ID, name, address, and phone number. The order table lists orders with an order number, customer ID, and product ID. The product table lists products with a product ID, name, and price. It also briefly mentions that relational theory is based on set theory and discusses some limitations of relational databases as well as the concept of polyglot persistence.
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Intro to Relational Databases and Relational Theory
- 1. Intro to Relational Databases Patricia Gorla @patriciagorla Apache Cassandra Architect The Last Pickle
- 2. About Me • Cassandra Architect chez The Last Pickle • Datastax MVP for Cassandra • Database Geek
- 4. Data has Relationships …but not all data models are created equal.
- 5. Customer Table Primary Key 231 Customer Name Yves Address Oran Phone Number 732 13001 732 Coco Saumur 123 12342 599 Ralph New York 523 10929 Case Study eCommerce
- 6. Customer Table Primary Key 231 Customer Name Yves Address Oran Phone Number 732 13001 732 Coco Saumur 123 12342 599 Ralph New York 523 10929 Order Table Order Number 10001 Customer ID 599 Product ID LUX 10002 599 CDG 10002 231 CDG Case Study eCommerce
- 7. Customer Table Primary Key 231 Customer Name Yves Address Oran Phone Number 732 13001 732 Coco Saumur 123 12342 599 Ralph New York 523 10929 Order Table Order Number 10001 Customer ID 599 Product ID LUX 10002 599 CDG 10002 231 CDG Product Table Product ID LUX Product Name BlenderBottle Price 7.99 CDG Pellegrino 1.49 BOI Eden Pond Turmeric 32.99 CHO CeraVe Moisturizer 12.99
- 8. Relational theory is built upon set theory.
- 9. Limitations Because nothing is perfect