CREATE TABLE table_203_308 (id DECIMAL, "athlete" TEXT, "nation" TEXT, "olympics" TEXT, "gold" DECIMAL, "silver" DECIMAL, "bronze" DECIMAL, "total" DECIMAL)

who has more silver medals : karine ruby or shaun white ?
SELECT "athlete" FROM table_203_308 WHERE "athlete" IN ('karine ruby', 'shaun white') ORDER BY "silver" DESC LIMIT 1
SELECT "athlete" FROM "table_203_308" WHERE "athlete" IN ('karine ruby', 'shaun white') ORDER BY "silver" DESC NULLS LAST LIMIT 1