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One way is to break into two field for sorting, like:

order by substring(cols,1,1), lpad(substring(cols,2),10,0)
                        ^ assuming only prefix single char 
                              ^ lpad like 0000000001

 

ORDER BY my_field

 

This will do the work. ORDER BY sorts numbers, strings, dates, etc in natural way.

 

ORDER BY LEFT(fld, 1), CAST(SUBSTRING(fld, 1) AS SIGNED)

 

 

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