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

• A. Python
• B. SQL
• C. C#
• D. R

Answer: (B)

SQL is the language used to query a data warehouse because it’s the standard, expressive way to retrieve and analyze structured data stored in tables. It lets you declaratively specify what data you want—filters, joins across tables, groupings, and aggregations—while the database engine handles the best way to execute those operations efficiently. Data warehouses are built around relational structures like facts and dimensions, and SQL provides the powerful constructs (SELECT, JOIN, GROUP BY, HAVING, window functions) needed for analytics across large datasets. Other languages like Python, R, or C# are great for scripting, data processing, and application code, but the actual querying work in a data warehouse is fundamentally done with SQL.