SQL-W3School- High: SQL RIGHT JOIN Keyword

ylbtech-SQL-W3School- High: SQL RIGHT JOIN Keyword

 

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SQL RIGHT JOIN Keyword

RIGHT JOIN keyword will be right table (table_name2) where all rows are returned, even though in the left table (table_name1) no matching rows .

RIGHT JOIN keyword syntax

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

Note: In some databases, RIGHT JOIN is called RIGHT OUTER JOIN.

The original table (used in the example):

"Persons" 表：

Id_P	LastName	FirstName	Address	City
1	Adams	John	Oxford Street	London
2	Bush	George	Fifth Avenue	New York
3	Carter	Thomas	Changan Street	Beijing

"Orders" 表：

Id_O	OrderNo	Id_P
1	77895	3
2	44678	3
3	22456	1
4	24562	1
5	34764	65

Right connection (RIGHT JOIN) Example

Now we want to list all the orders and those who ordered them - if any.

You can use the following SELECT statement:

SELECT Persons.LastName, Persons.FirstName, Orders.OrderNo
FROM Persons
RIGHT JOIN Orders
ON Persons.Id_P=Orders.Id_P
ORDER BY Persons.LastName

The results set:

LastName	FirstName	OrderNo
Adams	John	22456
Adams	John	24562
Carter	Thomas	77895
Carter	Thomas	44678
		34764

RIGHT JOIN keyword from the right table (Orders) where all rows are returned, even though in the left table (Persons) is not a match.

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https://www.w3school.com.cn/sql/sql_join_right.asp

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