ORDER/SORT Column mixed number and number prefixed by char

Question

I have a varchar column conteining a code, this code could by only numbers, or number prefixed by a char for example i have a column containing this data :

Answer 1

Assuming there's no spaces before the values and there can only be 1-char prefix:

ORDER BY
  CASE WHEN LEFT(Code, 1) BETWEEN '0' AND '9' THEN ' ' ELSE LEFT(Code, 1) END,
  CAST(STUFF(Code, 1, CASE WHEN LEFT(Code, 1) BETWEEN '0' AND '9' THEN 0 ELSE 1 END, '') AS int)

Alternatively, the second criterion could be rewritten like this:

  CAST(STUFF(Code, 1, PATINDEX('[^0-9]%', Code), '') AS int)

PATINDEX('[^0-9]%', Code) returns 1 if it finds a non-numeric character at the beginning of Code, and 0 otherwise. As a result, STUFF either removes 1 character, or none, i.e. same as previously.