[Yandex Cloud documentation](../../index.md) > [Yandex Query](../index.md) > [Concepts](index.md) > Analytical data processing > Federated queries

# Federated queries

Federated queries provide a way to process data from multiple data sources with a single query. Currently, federated queries can work with ClickHouse® and PostgreSQL databases and Yandex Object Storage data storages.

To work with data stored in external databases, you simply need to create a [connection](glossary.md#connection). To work with unschematized data stored in S3 buckets, you also need to create a [data binding](glossary.md#binding).

Read more about working with different data sources in these sections:
* [ClickHouse®](../sources-and-sinks/clickhouse.md).
* [Greenplum®](../sources-and-sinks/greenplum.md).
* [MySQL®](../sources-and-sinks/mysql.md).
* [PostgreSQL](../sources-and-sinks/postgresql.md).
* [S3](../sources-and-sinks/object-storage-binding.md).
* [YDB](../sources-and-sinks/ydb.md).

Example of how to use federated queries in Yandex Query:



## Use cases {#examples}

* [Federated queries](../tutorials/yq-federative-queries.md)