There's some activity in this space. Hasura uses a GraphQL-SQL compiler to generate Postgres SQL queries directly from a graphql query: https://hasura.io/ http

There's some activity in this space. Hasura uses a GraphQL-SQL compiler to generate Postgres SQL queries directly from a graphql query: https://hasura.io/ https://hasura.io/ FaunaDB, EdgeDB and DGraph are examples of databases that expose a GraphQL API.