bsd:state afra$ time postgres state_demo2 < totals.sql
 performance_level |        percentage         | num_students | total_students
-------------------+---------------------------+--------------+----------------
 M                 | 19.3521986061853624660000 |         7803 |          40321
 B                 | 19.8308573696088886680000 |         7996 |          40321
 E                 | 36.1994990203615981750000 |        14596 |          40321
 W                 | 24.6174450038441506910000 |         9926 |          40321
(4 rows)


real	0m0.251s