Module 2: Data Modeling & SQL (The Library System)
📚 Module 2: Data Modeling & SQL
Course ID: DE-702
Subject: The Library System
In Data Engineering, you must Organize data so it’s fast to search.
🏗️ Step 1: Normalization (The “Library System”)
Instead of writing an author’s bio in every book they ever wrote, you have a separate Authors table and link them via an ID.
🏗️ Step 2: SQL (The “Librarian’s Language”)
- SELECT: Columns.
- FROM: Table.
- JOIN: Combine tables.
- WHERE: Filter rows.
🥅 Module 2 Review
- Data Modeling: Designing table connections.
- Normalization: Splitting data to avoid redundancy.
- SQL: Talking to a librarian.
:::tip Slow Learner Note Just think of it as Talking to a Librarian. You’re just asking for specific rows and columns! :::