CREATE TABLE table_22018 ("Club" TEXT, "Played" TEXT, "Won" TEXT, "Drawn" TEXT, "Lost" TEXT, "Points for" TEXT, "Points against" TEXT, "Tries for" TEXT, "Tries against" TEXT, "Try bonus" TEXT, "Losing bonus" TEXT, "Points" TEXT)

When 17 is the tries for what is the points against?
SELECT "Points against" FROM table_22018 WHERE "Tries for" = '17'
SELECT "Points against" FROM "table_22018" WHERE "Tries for" = '17'