Quick Reference
The INNER JOIN keywords returns rows that have matching values in both tables.
The following returns all orders that have customer information.
SELECT Orders.order_id, Customers.last_name, Customers.first_name
FROM Orders
INNER JOIN Customers ON Orders.customer_id = Customers.customer_id;Note
The INNER JOIN keywords selects all rows from both tables as long as there is a match between the columns. If there are records in the Orders table that do not have matches in the Customers table, these orders will not be shown.
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
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