display job Title, the difference between minimum and maximum salaries for those jobs which max salary within the range 12000 to 18000.
SELECT job_title ,  max_salary - min_salary FROM jobs WHERE max_salary BETWEEN 12000 AND 18000
difference between minimum and maximum salaries refers to max_salary - min_salary; max salary within the range 12000 to 18000 refers to WHERE max_salary BETWEEN 12000 AND 18000; display job title refers to SELECT job_title;