Summary

To recap the GraphQL query language, we can send one or more operations in a GraphQL document. Each operation has a (possibly nested) selection set, which is a set of fields, each of which may have arguments. We can also:

• Declare variables after the operation name.
• Alias fields to give them different names in the response object.
• Create named fragments to reuse fields and add type conditions to conditionally select fields from interfaces and unions.
• Add directives to modify how the server handles a part of a document.
• Use mutations to alter data.
• Use subscriptions to receive events from the server.