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MySQL GROUP BY Statement

The MySQL GROUP BY Statement

The GROUP BY statement groups rows that have the same values into summary rows, like "find the number of customers in each country".

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:

CustomerID

CustomerName

ContactName

Address

City

PostalCode

Country

1

Alfreds Futterkiste

Maria Anders

Obere Str. 57

Berlin

12209

Germany

2

Ana Trujillo Emparedados y helados

Ana Trujillo

Avda. de la Constitución 2222

México D.F.

05021

Mexico

3

Antonio Moreno Taquería

Antonio Moreno

Mataderos 2312

México D.F.

05023

Mexico

4

Around the Horn

Thomas Hardy

120 Hanover Sq.

London

WA1 1DP

UK

5

Berglunds snabbköp

Christina Berglund

Berguvsvägen 8

Luleå

S-958 22

Sweden

MySQL GROUP BY Examples

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

ExampleGet your own SQL Server

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:

Example

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:

OrderID

CustomerID

EmployeeID

OrderDate

ShipperID

10248

90

5

1996-07-04

3

10249

81

6

1996-07-05

1

10250

34

4

1996-07-08

2

And a selection from the "Shippers" table:

ShipperID

ShipperName

1

Speedy Express

2

United Package

3

Federal Shipping

GROUP BY With JOIN Example

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

Example

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

 

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