oracle - sql order by numeric string -


I am using Oracle 10. I need to sort my result set according to two numerical string fields. One type of criterion area keeps such data: FIELD1: 

  FO-00001001001 FO-00001002001 FO-00001003001 Class-00001003001 FC-1022001003001

Other: 

  FIELD2: 000203 000567 349990

I need to combine two criteria, first criteria take precedence, as a result of which the ascending order is required is.

How do I write this SQL?

Since the numbers are null-padded, so you can compare them as strings: 

  SELECT ... from ... ORDER field1 ASC, field2 ASC

or if you want to ignore prefix in field1 : <: > 

  SELECT ..., SUBSTR (field 1, 3) from AS stripped_field1 ... order by stripped_field1 ASC, field2 ASC

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