SQL LEFT JOIN Keyword
LEFT JOIN
The LEFT JOIN command returns all rows from
the left table, and the matching rows from the right table. The result is NULL
from the right side, if there is no match.
The following SQL will select all customers, and any orders they might have:
Example
SELECT Customers.CustomerName, Orders.OrderID
FROM Customers
LEFT JOIN Orders
ON Customers.CustomerID = Orders.CustomerID
ORDER BY Customers.CustomerName;
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Note: The LEFT JOIN keyword returns all records from the
left table (Customers), even if there are no matches in the right table
(Orders).
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