Do you use the GROUP BY operator in your SQL queries?

Yes, the GROUP BY operator is often used in SQL queries when you need to group rows by one or more columns and perform aggregate functions (such as COUNT, SUM, AVG) for each group.

For example, if there is an orders table and you want to find out the number of orders for each customer, you can write a query:

SELECT customer_id, COUNT(*) AS orders_count
FROM orders
GROUP BY customer_id;

This will group all records by customer_id and count the number of orders for each customer. GROUP BY is useful for data analysis and creating summary reports.