What is average age for different job title?
SELECT avg(age) ,  job FROM Person GROUP BY job
SELECT avg(age) ,  job FROM Person GROUP BY job
[{'avg(age)': 45.0, 'job': 'doctor'}, {'avg(age)': 35.0, 'job': 'engineer'}, {'avg(age)': 25.5, 'job': 'student'}]