Table: rugby_tour_1990
Columns: opposing_team
against
date
venue
status

Question: Sum of cuyo selection as the opposing team?
SQL: SELECT SUM("against") FROM rugby_tour_1990 WHERE "opposing_team" = 'cuyo selection'

Question: Lowest against for tour match on 21 july 1990?
SQL: SELECT MIN("against") FROM rugby_tour_1990 WHERE "status" = 'tour match' AND "date" = '21 july 1990'