UNION ALL to select all (duplicate values also) cities from the "Customers" and "Suppliers" tables.
Query:
SELECT City FROM Customers
UNION ALL
SELECT City FROM Suppliers
ORDER BY City;
Result:
Number of Records: 12
City
-------
Aachen
Albuquerque
Anchorage
Ann Arbor
Annecy
Barcelona
Barquisimeto
Bend
Bergamo
Berlin
Berlin
Bern