What are the First names of students living in smith hall?
SELECT T1.fname FROM student AS T1 JOIN lives_in AS T2 ON T1.stuid   =   T2.stuid JOIN dorm AS T3 ON T3.dormid   =   T2.dormid WHERE T3.dorm_name   =   'Smith Hall'
First names of students = SELECT T1.fname; living in smith hall refers to WHERE T3.dorm_name = 'Smith Hall'; joining conditions to link student, lives_in, and dorm tables.