query: SELECT avg(num_employees) FROM department WHERE ranking BETWEEN 10 AND 15
question: What is the average number of employees of the departments whose rank is between 10 and 15?
query_toks: SELECT avg ( num_employees ) FROM department WHERE ranking BETWEEN 10 AND 15
query_toks_no_value: select avg ( num_employees ) from department where ranking between value and value
question_toks: What is the average number of employees of the departments whose rank is between 10 and 15?