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SUM fields = none statement deletes the first or last record

 
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bdweirdt

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Joined: 09 Nov 2006
Posts: 2

PostPosted: Thu Nov 09, 2006 6:21 pm    Post subject: SUM fields = none statement deletes the first or last record
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Hello,

Can anyone tell me if the 'sum fields=none' statement deletes the first or the second record when it encounters two duplicate records?

thx in advance,

Bart
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Frank Yaeger

DFSORT Moderator


Joined: 15 Feb 2005
Posts: 7130
Location: San Jose, CA

PostPosted: Mon Nov 13, 2006 11:04 pm    Post subject:
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If EQUALS is in effect, DFSORT will keep the first record. If NOEQUALS is in effect, DFSORT can keep either record. You can specify EQUALS like this:

Code:

//DFSPARM DD *
   OPTION EQUALS
/*


You can use the SELECT operator of DFSORT's ICETOOL with the FIRST or LAST operand to tell DFSORT to keep the first or last record, respectively.

If you're not familiar with DFSORT and DFSORT's ICETOOL, I'd suggest reading through "z/OS DFSORT: Getting Started". It's an excellent tutorial, with lots of examples, that will show you how to use DFSORT, DFSORT's ICETOOL and DFSORT Symbols. You can access it online, along with all of the other DFSORT books, from:

www.ibm.com/servers/storage/support/software/sort/mvs/srtmpub.html
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