You can use this join-level keyword
to specify the order in which records with duplicate join fields are presented
when your program reads a join logical file.
The format of the keyword is:
JDUPSEQ(sequencing-field-name [*DESCEND])
http://publib.boulder.ibm.com/infocenter/iseries/v7r1m0/index.jsp?topic=%2Frzakb%2Frzakbmsttdjdups.htm
ITS USEFUL TO EVERY NEW COMERS WHO THOSE GUYS LEARNING AS400
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