← All Units

Unit 2

Data — Where Information Lives

Databases, SQL, storage, and how apps remember things.

  1. 01

    What Is a Database?

    The spreadsheet mental model, rows, columns, tables, and why RAM isn't enough

    4 pages
  2. 02

    SQL — Talking to the Database

    SELECT, INSERT, UPDATE, WHERE — the language databases understand

    6 pages
  3. 03

    Relational Data

    Foreign keys, joins, and why one table is never enough

    7 pages
  4. 04

    Supabase — A Database You Can Use

    Real setup, real queries, connecting to your apps

    soon
  5. 05

    Other Database Types

    Redis, MongoDB, and when to pick each one

    soon