| Aggregate (cost=27.64..27.65 rows=1 width=8) |
| -> Hash Right Join (cost=10.45..24.09 rows=20 width=100) |
| Hash Cond: (cl.id = c.client_class) |
| -> Seq Scan on tbl_client_classes cl (cost=0.00..12.50 rows=250 width=44) |
| -> Hash (cost=10.20..10.20 rows=20 width=60) |
| -> Seq Scan on tbl_clients c (cost=0.00..10.20 rows=20 width=60) |
| Filter: (client_class IS NOT NULL) |