PolyBase is the technology introduced with SQL Server 2016 to run distributed queries across heterogeneous environments. Initially offering limited support for external systems, SQL Server 2019 extended it to support not only Hadoop and SQL Server in all its forms, including Azure SQL Data Warehouse, but also Teradata, Oracle, MongoDB, and generic systems accessible via ODBC. In this session, we will look at how the integration mechanism works from a technical perspective, with a few practical examples.