SQL In Java

Not sure if I'm in the right list for this question but...
is it possible to join two files by a Roll Number, then order the 
resultset by two different fields?  Example:
I have two files on the iSeries.  One is a master, the other is a 
supplementary file that contains extra information.  They are joined by a 
roll number (15 digit number assigned to a property).  The master file has 
a name field and the supplementary file has a trade name field.  Sometimes 
the name field contains the business name, sometimes the trade name field 
does.  I want to get a result set that sorts the files where if the trade 
name field is populated to use that in the sort otherwise use the name 
field in the sort.  So if we have the following files:
Record1: Name="aaa" tradename=""
Record2: Name="aac" tradename=""
Record3: Name="aad" tradename="aab"

So that they output in the following order:
Record1
Record3
Record2

Thanks,

Ron Power
Programmer
Information Services
City Of St. John's, NL
P.O. Box 908
St. John's, NL
A1C 5M2
709-576-8132
rpower@xxxxxxxxxx
http://www.stjohns.ca/
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