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SQL LEFT JOIN

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SQL LEFT JOIN Description

The keyword LEFT JOIN returns all records from the left table (table1) and the corresponding records from the right table (table2).

The result will be 0 entries on the right side if there is no match.


LEFT JOIN Syntax

SELECT column_name(s)
FROM table1
LEFT JOIN table2
ON table1.column_name = table2.column_name
In some databases, LEFT JOIN is called LEFT OUTER JOIN.

SQL INNER JOIN

Demonstration database

In this tutorial we will use the famous example database "Northwind".

Below is a sample from the table "Customers" ("Customers"):

CustomerIDCustomerNameContactNameAddressCityPostalCodeCountry
1Alfreds FutterkisteMaria AndersObere Str. 57Berlin12209Germany
2Ana Trujillo Emparedados y heladosAna TrujilloAvda. de la Constitución 2222México D.F.5021Mexico
3Antonio Moreno TaqueríaAntonio MorenoMataderos 2312México D.F.5023Mexico
4Around the HornThomas Hardy120 Hanover Sq.LondonWA1 1DPUK
5Berglunds snabbköpChristina BerglundBerguvsvägen 8LuleåS-958 22Sweden

And the sample from the table "Orders" ("Orders"):

ProductIDOrderIDCustomerIDEmployeeIDOrderDateShipperID
1102489051996-07-043
2102498161996-07-051
3102503441996-07-082
4102518431996-07-081
5102527641996-07-092

SQL LEFT JOIN Example

The following SQL statement will select all customers and any orders they may have:

Run SQLSELECT Customers.CustomerName, Orders.OrderID 
FROM Customers 
LEFT JOIN Orders ON Customers.CustomerID = Orders.CustomerID 
ORDER BY Customers.CustomerName
The LEFT JOIN keyword returns all records from the left table (Customers), even if there are no matches in the right table (Orders).
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