Data federation
Data federation is a technique that allows you to query data from multiple sources as if it were all stored in a single database. This can be useful if you have data that is stored in different systems, or if you want to be able to query data from multiple sources without having to move it to a single database.
Federated queries are queries that are executed against multiple data sources. It can be used to join data from different sources or to perform complex queries that would be difficult or impossible to execute against a single data source.
Google Cloud databases support federated queries through the use of the BigQuery Federated Query Service. The BigQuery Federated Query Service allows you to query data from a variety of data sources, including the following:
- Google Cloud BigQuery
- Google Cloud Spanner
- Google Cloud SQL
- Amazon Redshift
- Microsoft Azure SQL Database
The BigQuery Federated Query Service is a powerful tool that...
