Re: Tie Breaker in SORTA

When sorting (using most any facility) initial sequence is rarely guaranteed to be maintained. So whenever two records have the same key the sequence in which they appear in the final result is indeterminate.

If you want them to retain original sequence, or indeed use any secondary key, then you need to use a method that allows for multiple keys - such as the qsort API. There is an example of how to use this in the RPG Redbook "Who Knew ..." http://www.redbooks.ibm.com/redbooks/pdfs/sg245402.pdf


On 2014-06-06, at 3:10 PM, Ashwani Singh <Ashwani.Singh@xxxxxxxxxx> wrote:

Hello ,

I have code where I need to sort a DS array basis of a sequence field..

D UDFNoListN DS Qualified
D UDFNoEntry 50 DIM(100)
D UDFNoListS 44 Overlay(UDFNoEntry:*Next)
D UDFNoAppSeq 6S 0 INZ(*hival)Overlay(UDFNoEntry:*Next)


SORTA UDFNoAppSeq;

With this input
UDFNOLISTN.UDFNOLISTS(1) = 'XXFIV01 XX Rate XXFIV01 ¬A1' 050002

UDFNOLISTN.UDFNOLISTS(2) = 'XXFIV05 XxFIV05 XXFIV05 ¬A1' 050003

UDFNOLISTN.UDFNOLISTS(3) = 'XXTHI01 XXTHI01 XXTHI01­ A1' 050001

UDFNOLISTN.UDFNOLISTS(4) = 'XXSEV01 XXXX Rate XXSEV01 "P1' 050002

UDFNOLISTN.UDFNOLISTS(5) = 'XXSEV02 XXSEV02 XXSEV02 "P1' 050999

Output

UDFNOLISTN.UDFNOLISTS(3) = 'XXTHI01 XXTHI01 XXTHI01­ A1' 050001
UDFNOLISTN.UDFNOLISTS(4) = 'XXSEV01 XXXX Rate XXSEV01 "P1' 050002
UDFNOLISTN.UDFNOLISTS(1) = 'XXFIV01 XX Rate XXFIV01 ¬A1' 050002

I would have expected element 1 above 4 but its not ? Any particular reason...

Etc..

Thanks,
Ashwani Singh
Technical Analyst
Global Services
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