What is the primary language used for querying a data warehouse?

• A. Python
• B. C#
• C. SQL
• D. R

Answer: (C)

Querying a data warehouse is done primarily with SQL. SQL, or Structured Query Language, is designed specifically for retrieving and manipulating data stored in relational structures, which is exactly what a data warehouse holds. With SQL you write SELECT queries to fetch data, use JOINs to combine tables, and apply aggregations with GROUP BY, HAVING, and ORDER BY. Major data warehouse platforms—like Snowflake, Azure Synapse, Redshift, and BigQuery—rely on SQL as the standard interface, so it’s the language you’ll use most often to query and analyze data. While Python, C#, and R are excellent for scripting, automation, and analytics workflows, they’re not the primary language for issuing queries to a warehouse; they typically run alongside SQL or drive SQL queries rather than replace it.