#h -FS cid sid cname
10  1  pascal
11  2  numanal
12  1  os
12  2  os
# - COMMENTS:
#  | dbsort -n cid
# TEST/dbjoin_ex_S.in-2 COMMENTS:
# joined comments:
#  | dbjoin -S - TEST/dbjoin_ex_S.in-2 -n cid