SELECT first_name FROM Professionals UNION SELECT first_name FROM Owners EXCEPT SELECT name FROM Dogs
Find the first names that are used for professionals or owners but are not used as dog names.
SELECT first_name FROM Professionals UNION SELECT first_name FROM Owners EXCEPT SELECT name FROM Dogs
select first_name from professionals union select first_name from owners except select name from dogs
Find the first names that are used for professionals or owners but are not used as dog names .