SQL GROUP BY Statement

The SQL GROUP BY Statement

The GROUP BY statement is often used with aggregate functions (COUNT, MAX, MIN, SUM, AVG) to group the result-set by one or more columns.

GROUP BY Syntax

SELECT column_name(s)
FROM table_name
WHERE condition
GROUP BY column_name(s)
ORDER BY column_name(s);

Demo Database

Below is a selection from the "Customers" table in the Northwind sample database:

SQL GROUP BY Examples

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

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

The following SQL statement 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;

Demo Database

Below is a selection from the "Orders" table in the Northwind sample database

And a selection from the "Shippers" table:

GROUP BY With JOIN Example

The following SQL statement lists the number of orders sent by each shipper:

SELECT Shippers.ShipperName, COUNT(Orders.OrderID) AS 
NumberOfOrders FROM Orders
LEFT JOIN Shippers ON Orders.ShipperID = Shippers.Shippe
GROUP BY ShipperName;