SELECT name FROM singer WHERE birth_year = 1948 OR birth_year = 1949	singer

SELECT DISTINCT winner_name FROM matches ORDER BY winner_age LIMIT 3	wta_1

SELECT city FROM employee WHERE age < 30 GROUP BY city HAVING COUNT ( * ) > 1	employee_hire_evaluation

SELECT t1.last_name FROM Owners AS t1 JOIN Dogs AS t2 ON t1.owner_id = t2.owner_id WHERE t2.age = (SELECT max(age) FROM Dogs)	dog_kennels

SELECT first_name FROM professionals UNION SELECT first_name FROM owners EXCEPT SELECT name FROM dogs	dog_kennels