1GraphQL SDL Schemas, Queries & Mutations

GraphQL SDL Schemas, Queries & Mutations

Explore declarative data fetching, Schema Definition Language (SDL), AST query parsing, and exact client selection mechanics.

2Resolver Architecture & Context Passing

Resolver Architecture & Context Passing

Analyze the 4-argument resolver signature (parent, args, context, info), field-level authorization, and null bubble-up mechanics.

3N+1 Query Problem & DataLoader Batching

N+1 Query Problem & DataLoader Batching

Diagnose exponential query degradation under nested resolvers and implement the DataLoader batching and memoization pattern.

4Real-Time GraphQL Subscriptions & Federation

Real-Time GraphQL Subscriptions & Federation

Deploy enterprise Supergraphs with Apollo Federation @key directives and manage real-time WebSocket subscriptions over distributed PubSub brokers.