SQL FULL JOIN Keyword

The FULL JOIN keyword return rows when there is a match in one of the tables. SQL FULL JOIN Syntax SELECT column_name(s) FROM tabl...


The FULL JOIN keyword return rows when there is a match in one of the tables.

SQL FULL JOIN Syntax

SELECT column_name(s) FROM table_name1
FULL JOIN table_name2 ON 
table_name1.column_name=table_name2.column_name


SQL FULL JOIN Example

The "Persons" table:

P_Id LastName FirstName Address City
1 Hansen Ola Timoteivn 10 Sandnes
2 Svendson Tove Borgvn 23 Sandnes
3 Pettersen Kari Storgt 20 Stavanger

The "Orders" table:

O_Id OrderNo P_Id
1 77895 3
2 44678 3
3 22456 1
4 24562 1
5 34764 15

Now we want to list all the persons and their orders, and all the orders with their persons.
We use the following SELECT statement:

SELECT Persons.LastName, Persons.FirstName,
Orders.OrderNo FROM Persons FULL JOIN
Orders ON Persons.P_Id=Orders.P_Id
ORDER BY Persons.LastName 

The result-set will look like this:

LastName FirstName OrderNo
Hansen Ola 22456
Hansen Ola 24562
Pettersen Kari 77895
Pettersen Kari 44678
Svendson Tove
34764

The FULL JOIN keyword returns all the rows from the left table (Persons), and all the rows from the right table (Orders). If there are rows in "Persons" that do not have matches in "Orders", or if there are rows in "Orders" that do not have matches in "Persons", those rows will be listed as well.
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SQL FULL JOIN Keyword
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