CREATE TABLE "matches" (
  "opposing_team" text,
  "against" real,
  "date" text,
  "venue" text,
  "status" text
);

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

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