Who was the under-15 when Moises Galvez	was the under-17?
CREATE TABLE "boys" (
  "year" real,
  "under_11" text,
  "under_13" text,
  "under_15" text,
  "under_17" text,
  "under_19" text
);
SELECT "under_15" FROM "boys" WHERE "under_17"='Moises Galvez';