left join on

Original link: https: //www.w3school.com.cn/sql/sql_join_left.asp

Left connecting (LEFT JOIN) Example

Now we want to list all of them, and their orders - if any.

You can use the following SELECT statement:

SELECT Persons.LastName, Persons.FirstName, Orders.OrderNo
FROM Persons
LEFT 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
Bush	George

LEFT JOIN keyword from the left table (Persons) where all rows are returned, even in the right table (Orders) no matching rows.