SELECT city FROM city WHERE regional_population  >  10000000 UNION SELECT city FROM city WHERE regional_population  <  5000000
Which cities have regional population above 8000000 or below 5000000?
SELECT city FROM city WHERE regional_population > 10000000 UNION SELECT city FROM city WHERE regional_population < 5000000
select city from city where regional_population > value union select city from city where regional_population < value
Which cities have regional population above 8000000 or below 5000000 ?