user: Question: What is the minimum D (max) when the Morse Taper number is less than 0?
Columns: ['Morse Taper number', 'Taper', 'B (max)', 'C (max)', 'D (max)']
Types: ['real', 'text', 'real', 'real', 'real']
Sample row: [0.0, '1:19.212', 56.5, 59.5, 10.5]
SQL:

assistant: SELECT MIN("D (max)") FROM "Table" WHERE "Morse Taper number" < 0.0;