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Crucial Exams

CompTIA Data+ DA0-002 (V2) Practice Question

You are building a monthly revenue report in a PostgreSQL 15 database. The source table orders stores the precise purchase timestamp in the column order_created_at (TIMESTAMP). Before aggregating, you must transform every timestamp so that all rows from the same calendar month are grouped under the identical key (for example, 2025-03-15 and 2025-03-31 should both become 2025-03-01 00:00:00). Which single SQL expression will perform this normalization in one step so you can immediately use it in a GROUP BY clause?

  • EXTRACT(month FROM order_created_at)

  • TO_CHAR(order_created_at, 'YYYY-MM')

  • DATEDIFF('month', order_created_at, CURRENT_DATE)

  • DATE_TRUNC('month', order_created_at)

CompTIA Data+ DA0-002 (V2)
Data Analysis
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