CREATE TABLE table_name_27 (ft VARCHAR2, taper NUMBER, large_end VARCHAR2)

Which Taper/ft that has a Large end smaller than 0.5, and a Taper of #2?
SELECT MAX(taper) / ft FROM table_name_27 WHERE large_end < 0.5 AND taper = "#2"
SELECT MAX("taper") / NULLIF("ft", 0) FROM "table_name_27" WHERE "#2" = "taper" AND "large_end" < 0.5