SQL FULL JOIN

The FULL JOIN returns all rows when there is a match in either the left or right table.

If a row in the left table has no match in the right table, the result set includes the left row's data and NULL values for all columns of the right table.

If a row in the right table has no match in the left table, the result set includes the right row's data and NULL values for all columns of the left table.

The FULL JOIN and FULL OUTER JOIN keywords are equal - the OUTER keyword is optional.

SQL FULL OUTER JOIN

Note: FULL JOIN can potentially return very large result-sets!

FULL JOIN Syntax

SELECT column_name(s)
FROM table1
FULL JOIN table2
ON table1.column_name = table2.column_name
WHERE condition;

Demo Database

Below is a selection from the "Customers" table:

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

And a selection from the "Orders" table:

OrderID	CustomerID	EmployeeID	OrderDate	ShipperID
10308	2	7	1996-09-18	3
10309	37	3	1996-09-19	1
10310	77	8	1996-09-20	2

SQL FULL JOIN Example

The following SQL statement selects all customers, and all orders:

Example

SELECT Customers.CustomerName, Orders.OrderID
FROM Customers
FULL JOIN Orders
ON Customers.CustomerID = Orders.CustomerID;

Try it Yourself »

A selection from the result-set may look like this:

CustomerName	OrderID
Null	10309
Null	10310
Alfreds Futterkiste	Null
Ana Trujillo Emparedados y helados	10308
Antonio Moreno Taquería	Null

Note: FULL JOIN returns all matching records from both tables whether the other table matches or not. So, if there are rows in "Customers" that do not have matches in "Orders", or if there are rows in "Orders" that do not have matches in "Customers", those rows will be listed as well.

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