CREATE TABLE table_46917 ("Year" FLOAT, "Winner" TEXT, "Jockey" TEXT, "Trainer" TEXT, "Owner" TEXT)

Who was the trainer when Mckaymackenna won?
SELECT "Trainer" FROM table_46917 WHERE "Winner" = 'mckaymackenna'
SELECT "Trainer" FROM "table_46917" WHERE "Winner" = 'mckaymackenna'