What are 3 ways SQL can access a relational database?

SELECT * FROM Customers
WHERE City LIKE 'ber%';
SELECT * FROM Customers
WHERE City LIKE '%es%';

SELECT Customers.CustomerName, Orders.OrderID
FROM Customers
INNER JOIN Orders
ON Customers.CustomerID=Orders.CustomerID
ORDER BY Customers.CustomerName;

I did a lot of SQL in my second half of my school, so I know it is not that different from this.