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Full Stack Web Development · Module 6 of 10

Databases

Store and query application data.

📖 Key ideas

  1. Relational (MySQL, PostgreSQL) for structured data with SQL.
  2. NoSQL (MongoDB, Firestore) for flexible documents.
  3. CRUD: Create, Read, Update, Delete.
  4. ORMs/ODMs: Prisma, Sequelize, Mongoose.
  5. Indexes speed queries; parameterised queries prevent injection.
💡 Real-life example: The database is the pantry: organised shelves so the kitchen finds ingredients fast.
SQLLanguage for relational databases
NoSQLNon-relational databases
CRUDCreate, Read, Update, Delete
ORMObject-Relational Mapper