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Together with GROUP BY, the following SQL aggregate functions are used:

• COUNT() - counts the number of rows in the group.
• SUM() - calculates the sum of values in a numeric column of the group.
• AVG() - calculates the average value in a numeric column of the group.
• MIN() - finds the minimum value in the group.
• MAX() - finds the maximum value in the group.

For example:

SELECT
    category,
    COUNT(*) AS total_products,
    SUM(price) AS total_price,
    AVG(price) AS average_price
FROM
    products
GROUP BY
    category;