query: SELECT Fname ,  Lname ,  Age FROM Student WHERE Sex  =  'F'
question: Show first name, last name, age for all female students. It is F. that their sex
query_toks: SELECT Fname , Lname , Age FROM Student WHERE Sex = 'F '
query_toks_no_value: select fname , lname , age from student where sex = value
question_toks: Show first name, last name, age for all female students. It is F. that their sex