CREATE TABLE table_204_859 (id DECIMAL, "year" DECIMAL, "seniors  ( trood award & rodda medal ) " TEXT, "reserves  ( rex hartley medal ) " TEXT, "under 18's  ( bruce wilkinson medal ) " TEXT, "under 16's  ( shaw/carter medal ) " TEXT)

who is the first under 18 bruce wilkinson medal winner ?
SELECT "under 18's (bruce wilkinson medal)" FROM table_204_859 WHERE NOT "under 18's (bruce wilkinson medal)" IS NULL ORDER BY "year" LIMIT 1
SELECT "under 18's (bruce wilkinson medal)" FROM "table_204_859" WHERE NOT "under 18's (bruce wilkinson medal)" IS NULL ORDER BY "year" NULLS FIRST LIMIT 1