Final answer:
True, an outer join operator can be used in the FROM clause to list all rows from one table that do not have a corresponding row in the other table, including left, right, or full outer joins.
Step-by-step explanation:
An outer join is indeed used in SQL in the FROM clause of a query to combine rows from two or more tables. Specifically, an outer join can be a left, right, or full outer join. A left outer join will return all rows from the left table and the matched rows from the right table, along with NULLs for rows with no match in the right table. Conversely, a right outer join returns all rows from the right table, along with the matched rows from the left table or NULLs where there is no match. Lastly, a full outer join returns all rows when there is a match in either the left or right table, which means it includes rows with no corresponding match in both tables.
For example, if you have two tables, Orders and Customers, and want to find all customers along with their orders, you could use a left outer join to list all customers (from the Customers table) and their orders (from the Orders table), including those customers who have not placed any orders. The SQL statement might look like this:
SELECT Customers.CustomerName, Orders.OrderID
FROM Customers
LEFT JOIN Orders
ON Customers.CustomerID = Orders.CustomerID;
To answer the question: a) True. An outer join operator can be included in a FROM clause to list all rows from one table that do not have a corresponding row in the other table.