What is the minimum salary in each department?
SELECT MIN(salary) ,  department_id FROM employees GROUP BY department_id
SELECT MIN(salary) ,  department_id FROM employees GROUP BY department_id
[{'MIN(salary)': 7000, 'DEPARTMENT_ID': 0}, {'MIN(salary)': 4400, 'DEPARTMENT_ID': 10}, {'MIN(salary)': 6000, 'DEPARTMENT_ID': 20}, {'MIN(salary)': 2500, 'DEPARTMENT_ID': 30}, {'MIN(salary)': 6500, 'DEPARTMENT_ID': 40}, {'MIN(salary)': 2100, 'DEPARTMENT_ID': 50}, {'MIN(salary)': 4200, 'DEPARTMENT_ID': 60}, {'MIN(salary)': 10000, 'DEPARTMENT_ID': 70}, {'MIN(salary)': 6100, 'DEPARTMENT_ID': 80}, {'MIN(salary)': 17000, 'DEPARTMENT_ID': 90}, {'MIN(salary)': 6900, 'DEPARTMENT_ID': 100}, {'MIN(salary)': 8300, 'DEPARTMENT_ID': 110}]