Have you used aggregate functions in your work?

Yes, aggregate functions were widely used in work, especially in data analysis and reporting. For example, when testing databases or APIs, SQL with aggregate functions such as SUM(), COUNT(), AVG(), MAX(), MIN() was often applied. This allowed for quick retrieval of summary data, verification of calculation correctness, and detection of anomalies.

Example of usage in SQL:

SELECT product_id, COUNT(*) AS total_sales, AVG(price) AS average_price
FROM sales
GROUP BY product_id;

In automation testing, aggregate functions help verify that total indicators meet expectations, such as the total number of records or the average value of a sample.