GraphQL queries are used to fetch data from the server.
Hasura GraphQL engine auto-generates queries as part of the GraphQL schema from your Postgres schema model. It generates a range of possible queries and operators that also work with relationships defined in your SQL schema.
All tables of the database tracked by the GraphQL engine can be queried over the GraphQL endpoint.
If you have a tracked table in your database, its query field is added as a nested
field under the
query_root root level type.
Auto-generated query field schema
For example, the auto-generated schema for the query field for a table
author looks like this:
author ( distinct_on: [author_select_column] where: author_bool_exp limit: Int offset: Int order_by: [author_order_by!] ): [author]
See the :doc:`Query API reference <../api-reference/query>` for the full specifications
If a table is not in the
public Postgres schema, the query field will be of the format
You can explore the entire schema and the available queries using the
GraphiQL interface in the Hasura console.
Let’s take a look at the different queries you can run using the Hasura GraphQL engine. We’ll use examples based on a typical author/article schema for reference.
.. toctree:: :maxdepth: 1 simple-object-queries nested-object-queries aggregation-queries query-filters sorting distinct-queries pagination Using multiple arguments <multiple-arguments> multiple-queries custom-functions derived-data control-access