CREATE TABLE table_name_47 (d__max_ INT, morse_taper_number INT)

What is the minimum D (max) when the Morse Taper number is less than 0?
SELECT MIN(d__max_) FROM table_name_47 WHERE morse_taper_number < 0
SELECT MIN("d__max_") FROM "table_name_47" WHERE "morse_taper_number" < 0