Data Normalization

Normalization transforms data into a consistent, efficient structure. It's especially important for managing relational data and avoiding duplication.

Why Normalize?

Creating Lookup Tables

Denormalization (Joining)

Grouping Related Data

Exercise: Create Lookup

Exercise: Join Data

Key Points

• Normalization removes data duplication
• Create lookup tables for O(1) access
• Use reduce to group related data
• Denormalize when you need full objects
• Lookups: Object.fromEntries(arr.map(x => [x.id, x]))