CREATE TABLE table_21489362_2 (rr3_pts INT, rr4_pts VARCHAR)

When 20 is the rr4 points what is the lowest rr3 points?
SELECT MIN(rr3_pts) FROM table_21489362_2 WHERE rr4_pts = "20"
SELECT MIN("rr3_pts") FROM "table_21489362_2" WHERE "20" = "rr4_pts"