SELECT job_id "Job", COUNT(*) "#", MIN(salary) "MinSal",
ROUND(AVG(salary), 0) "AvgSal", MEDIAN(salary) "Median", MAX(salary)
"MaxSal", ROUND(STDDEV(salary)) "Std" FROM hr.employees GROUP BY
job_id ORDER BY job_id
Oracle only : stddev is not supported by PostgreSQL and MySQL