SQL GROUP BY Keyword

GROUP BY

The GROUP BY command is used to group the result set (used with aggregate functions: COUNT, MAX, MIN, SUM, AVG).

The following SQL lists the number of customers in each country:

SELECT COUNT(CustomerID), Country
FROM Customers
GROUP BY Country;

The following SQL lists the number of customers in each country, sorted high to low:

SELECT COUNT(CustomerID), Country
FROM Customers
GROUP BY Country
ORDER BY COUNT(CustomerID) DESC;