A grouping operation puts members of same attribute in a set into same group. In an employee table grouped by department, each group of employees work in the same department. In a grouped sales table ...

This guide provides an overview of how to use GROUP BY and aggregate functions in SQL. We will also cover how to filter grouped data using the HAVING clause. Examples of SQL queries will be provided ...

This article is also available as a PDF download. Arranging data in a manner that’s meaningful can be a challenge. Sometimes all you need is a simple sort. Often, you need more–you need groups you can ...