| HashAggregate (cost=16.88..16.97 rows=9 width=158) |
| Group Key: dd.id |
| -> Hash Join (cost=1.20..14.84 rows=407 width=158) |
| Hash Cond: (d.department_id = dd.id) |
| -> Seq Scan on tbl_documents d (cost=0.00..12.07 rows=407 width=16) |
| -> Hash (cost=1.09..1.09 rows=9 width=150) |
| -> Seq Scan on tbl_departments dd (cost=0.00..1.09 rows=9 width=150) |
| Filter: (id IS NOT NULL) |