Scenario: A data analyst wants to calculate the total number of orders placed by each customer. Which aggregation function would be appropriate in DB2, and what additional operation may be required?

The correct option is COUNT() with GROUP BY. COUNT() is used to count the number of rows, and GROUP BY is used to group the results by a specific column, in this case, the customer. This combination allows the data analyst to calculate the total number of orders placed by each customer. SUM() with WHERE clause calculates the total sum based on a condition, AVG() with DISTINCT calculates the average of distinct values, and MAX() with HAVING clause filters groups based on a condition after grouping.