IT Career Guides & Free Resources
Expert roadmaps, tutorials, salary guides and interview prep across Data Science, Generative AI, Python, Cloud & Analytics — written by GloryTecks trainers in Hyderabad.
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Athena Federated Queries Explained
Athena Federated Query lets one SQL statement read from sources outside S3, such as DynamoDB, MySQL or Redshift, and join them with data lake tables. This guide explains connectors, predicate pushdown, passthrough queries, the documented limits, how billing works, and when copying the data is the better design.
BigQuery Federated Queries Explained
A federated query lets BigQuery ask a live operational database a question and join the answer to warehouse tables, with no pipeline in between. This guide explains EXTERNAL_QUERY, shows on a sample database how much pushdown saves and where it stops, and covers connections, pricing, regions and when to replicate.