Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_47 (d__max_ INTEGER, morse_taper_number INTEGER)

### Question ###
What is the minimum D (max) when the Morse Taper number is less than 0?

### Accurate SQL ###

SELECT MIN(d__max_) FROM table_name_47 WHERE morse_taper_number < 0