Explain the concept of data grouping in databases and its application.

Data grouping in a database is the process of combining table rows based on one or more columns to aggregate information. The GROUP BY operator is commonly used in SQL.

For example, if you have a sales table, you can group data by date or salesperson to get the total sales volume for each day or for each salesperson.

Example:

SELECT seller_id, SUM(amount) AS total_sales
FROM sales
GROUP BY seller_id;

This allows analyzing data, identifying trends, and creating reports based on aggregated values.