#fsdb cid sid cname
10	1	pascal
11	2	numanal
12	1	os
12	2	os
13	3	-
14	-	theory
# cid 13: the unnamed class
#  | dbsort -n cid
# cid 14: the class with no students
#   | dbjoin -m merge -t outer --input TEST/dbjoin_outer.in-2 -n cid
