SELECT count(*) FROM Student WHERE city_code  =  "HKG" OR city_code  =  "CHI"
How many students live in HKG or CHI?
SELECT count ( * ) FROM Student WHERE city_code = `` HKG '' OR city_code = `` CHI ''
select count ( * ) from student where city_code = value or city_code = value
How many students live in HKG or CHI ?