collection-group-by.md
=> SELECT department, grants, SUM(apply_sum(grant_values))
FROM employees
GROUP BY grants, department;
department | grants | SUM
------------+--------------------------+--------
Physics | ["US-7376","DARPA-1567"] | 235000
Astronomy | ["US-7376","DARPA-1567"] | 9000
Physics | ["US-7376"] | 30000
(3 rows)