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:
Example
SELECT COUNT(CustomerID), Country
FROM Customers
GROUP BY Country;The following SQL lists the number of customers in each country, sorted high to low:
Example
SELECT COUNT(CustomerID), Country
FROM Customers
GROUP BY Country
ORDER BY COUNT(CustomerID) DESC;