PolyBase and External Tables

 

Azure Cloud Data Engineering Training in Hyderabad – Quality Thoughts

Quality Thoughts offers one of the best Azure Cloud Data Engineering courses in Hyderabad, ideal for graduates, postgraduates, working professionals, or career switchers. The course combines hands-on learning with an internship to make you job-ready in a short time.

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The course includes labs, projects, mock interviews, and resume building to enhance placement success.

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     1. Live Instructor-Led Training

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Join us to unlock careers in cloud data engineering. Our alumni work at top companies like TCS, Infosys, Deloitte, Accenture, and Capgemini.

Note: Azure Table and Queue Storage support NoSQL and message handling for scalable cloud apps

PolyBase and External Tables

PolyBase is a feature in SQL Server, Azure Synapse Analytics, and Azure SQL Data Warehouse that allows you to query external data stored outside the database (e.g., in Azure Blob Storage, Data Lake, Hadoop, or other relational databases) using standard T-SQL. Instead of importing data, PolyBase reads it on demand, enabling seamless integration between structured and unstructured data sources.

External Tables are database objects that represent this external data within your SQL environment. They define the schema and location of the data but do not store it internally. When queried, the data is retrieved directly from the source.

How it works:

Create an External Data Source (defines connection to the external system).

Create an External File Format (describes file type, e.g., CSV, Parquet).

Create an External Table (maps the external data’s structure).

Run T-SQL queries as if it’s a normal table—PolyBase handles data movement.

Benefits:

Query large datasets without ETL.

Integrate multiple data sources.

Reduce storage duplication.

Enable big data analytics from SQL tools.

Best practice: Use it for read-heavy, analytical workloads where on-demand access to large external datasets is needed.

Indexing in Azure SQL

Partitioning in Data Lake

Normalization vs Denormalization

Star and Snowflake Schemas

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