SQL FULL JOIN Statement

What does a SQL FULL JOIN return?

FULL JOIN returns all matching records from both tables whether the other table matches or not.
Be aware that a FULL JOIN can potentially return very large datasets.
These two: FULL JOIN and FULL OUTER JOIN are the same.

The SQL FULL JOIN syntax

The general syntax is:

SELECT column-names
  FROM table-name1 FULL JOIN table-name2 
    ON column-name1 = column-name2
 WHERE condition

The general FULL OUTER JOIN syntax is:

    SELECT column-names
  FROM table-name1 FULL OUTER JOIN table-name2 
    ON column-name1 = column-name2
 WHERE condition

SUPPLIER
Id
CompanyName
ContactName
City
Country
Phone
Fax
CUSTOMER
Id
FirstName
LastName
City
Country
Phone

SQL FULL JOIN Examples

Problem: Match all customers
and suppliers by country
SELECT C.FirstName, C.LastName, C.Country AS CustomerCountry, 
       S.Country AS SupplierCountry, S.CompanyName
  FROM Customer C FULL JOIN Supplier S 
    ON C.Country = S.Country
 ORDER BY C.Country, S.Country

This returns suppliers that have no customers in their country,
and customers that have no suppliers in their country,
and customers and suppliers that are from the same country.

Result: 195 records
FirstName LastName CustomerCountry SupplierCountry CompanyName
NULL NULL NULL Australia Pavlova, Ltd.
NULL NULL NULL Australia G'day, Mate
NULL NULL NULL Japan Tokyo Traders
NULL NULL NULL Japan Mayumi's
NULL NULL NULL Netherlands Zaanse Snoepfabriek
NULL NULL NULL Singapore Leka Trading
Patricio Simpson Argentina NULL NULL
Yvonne Moncada Argentina NULL NULL
Sergio Gutiérrez Argentina NULL NULL
Georg Pipps Austria NULL NULL
Roland Mendel Austria NULL NULL
Pascale Cartrain Belgium NULL NULL
Catherine Dewey Belgium NULL NULL
Bernardo Batista Brazil Brazil Refrescos Americanas LTDA
Lúcia Carvalho Brazil Brazil Refrescos Americanas LTDA
Janete Limeira Brazil Brazil Refrescos Americanas LTDA
Aria Cruz Brazil Brazil Refrescos Americanas LTDA
André Fonseca Brazil Brazil Refrescos Americanas LTDA
Mario Pontes Brazil Brazil Refrescos Americanas LTDA
Pedro Afonso Brazil Brazil Refrescos Americanas LTDA
Paula Parente Brazil Brazil Refrescos Americanas LTDA
Anabela Domingues Brazil Brazil Refrescos Americanas LTDA
Elizabeth Lincoln Canada Canada Ma Maison
Elizabeth Lincoln Canada Canada Forêts d'érables
Yoshi Tannamuri Canada Canada Ma Maison
Yoshi Tannamuri Canada Canada Forêts d'érables
Jean Fresnière Canada Canada Ma Maison


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