What is the purpose of the project operator in KQL (Kusto Query Language) queries?

• A. To apply aggregations such as count, sum, and avg.
• B. To specify which columns to include in your query output.
• C. To filter data based on specific conditions.
• D. To rename columns.

Answer: (B)

Projection in KQL shapes the data you return. The project operator specifies which columns to include in the query results and the order in which they appear, giving you control over the output schema. It’s the primary tool for trimming wide tables down to the fields you care about, which also helps readability and downstream analysis. You can even rename columns within the projection, for example: project TimeGenerated, UserId, PV = PageViews. This makes the output concise and tailored to your needs, while other operators handle filtering (where) or aggregating (summarize).