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Foundations · easy

1. Schema Definition Language (SDL) & Queries

Declarative data fetching without over/under-fetching.

1 min read1 questionsup to 50 XPtopic 1/5

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AI translates the explanation and quiz text while preserving code and answer scoring.

GraphQL lets clients request exactly the data fields they need:

graphql
type User {
  id: ID!
  username: String!
  wallets: [Wallet!]!
}

type Query {
  user(id: ID!): User
}

How to study this topic

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  2. 2. Re-read the code snippets and say out loud what each line does.
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Check your understanding

  1. 1. What primary problem does GraphQL solve over traditional REST APIs?

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