where group by having order by

The "GROUP BY" clause is used in SQL to divide the rows of a table into groups based on one or more columns. The "HAVING" clause is then used to filter the groups based on specified conditions. Finally, the "ORDER BY" clause is used to sort the result set based on specified columns.

For example, let's say we have a table called "Sales" with columns "Region", "Product", and "Revenue". If we want to group the sales by region and product, and then filter the groups to only include those with a total revenue greater than $1000, we can use the following query:

SELECT Region, Product, SUM(Revenue) AS TotalRevenue
FROM Sales
GROUP BY Region, Product
HAVING SUM(Revenue) > 1000
ORDER BY TotalRevenue DESC;

This query will return the region, product, and total revenue for each group that satisfies the condition specified in the "HAVING" clause. The result set will be sorted in descending order based on the total revenue.