Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement.

The phrase FROM Donors INNER JOIN DonationRecords ON tells SQL to find matching records between the two tables, based on the expression that follows the key word ON.

If you join two tables that both have missing rows, you can combine the effect of a left and a right join by using a full join. The following figure shows the results of this query.