CREATE TABLE table_204_319 (id DECIMAL, "mlb\ season" DECIMAL, "team\ season" DECIMAL, "league" TEXT, "division" TEXT, "finish" TEXT, "wins" DECIMAL, "losses" DECIMAL, "win %" DECIMAL, "gb" TEXT, "postseason" TEXT, "awards" TEXT)

how many years have the brewers competed in the nl ?
SELECT COUNT(DISTINCT "mlb\nseason") FROM table_204_319 WHERE "league" = 'nl'
SELECT COUNT(DISTINCT "mlb\nseason") FROM "table_204_319" WHERE "league" = 'nl'