Quick Reference
The LEFT JOIN keywords return 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 returns all customers and any orders they may have.
SELECT Customers.last_name, Customers.first_name, Orders.order_id
FROM Customers
LEFT JOIN Orders ON Customers.customer_id = Orders.customer_id
ORDER BY Customers.last_name;Note
The LEFT JOIN keywords selects all records from the left table, even if there are no matches in the right table.
SQL Notes:
- Any work being done to modify the structure of a database or delete tables or the the database itself should only be done after making a recent backup
We’d like to acknowledge that we learned a great deal of our coding from W3Schools and TutorialsPoint, borrowing heavily from their teaching process and excellent code examples. We highly recommend both sites to deepen your experience, and further your coding journey. We’re just hitting the basics here at 1SMARTchicken.