what are the student names who are in PHL city and are between 20 and 25 years of age | First name or last name? | first
SELECT fname FROM student WHERE city_code  =  'PHL' AND age BETWEEN 20 AND 25
student names who are in PHL city refers to city_code = 'PHL'; between 20 and 25 years of age refers to age BETWEEN 20 AND 25; first name or last name, specifically asking for first name refers to selecting fname;