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Equals option in sort

 
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paduchuri

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Joined: 03 Jan 2011
Posts: 32
Location: Hyderabad

PostPosted: Tue May 24, 2011 9:20 pm    Post subject: Equals option in sort
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Hi Every one,

Code:

SORT FIELDS=(1,6,CH,A),EQUALS
SUM FIELDS=NONE,XSUM         


I saw above code in my production control card,

some one please explain the functionality of the EQUALS option

I guess there is no need of using equals in above case.will in effect in the above case ? will the performence degrade in the above case?
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sqlcode1

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Joined: 08 Apr 2010
Posts: 578
Location: USA

PostPosted: Tue May 24, 2011 9:48 pm    Post subject:
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paduchuri,
Read about options here

Quote:
I guess there is no need of using equals in above case.will in effect in the above case ?
It may/can effect output. Run the same card with 2 input data shown below and observe output in each case.

However, looks like you have Syncsort installed at your shop.

Code:
AAAAAA01
AAAAAA02
AAAAAA03


Code:
AAAAAA03
AAAAAA02
AAAAAA01


Thanks,
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jerryte

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Joined: 29 Oct 2010
Posts: 187
Location: Toronto, ON, Canada

PostPosted: Tue May 31, 2011 1:20 am    Post subject:
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The EQUALS option will ensure that if two or more records have the same sort key values then the order of those records is preserved. This could require extra processsing cost since it has to keep track of the order. Avoid it if possible.

In the sample code given the EQUALS will ensure that the first record of a matching set is kept while any other matching records are written to the XSUM dataset.
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dick scherrer

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Joined: 23 Nov 2006
Posts: 19270
Location: Inside the Matrix

PostPosted: Tue May 31, 2011 2:59 am    Post subject:
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Hello,

Quote:
This could require extra processsing cost since it has to keep track of the order.
Very little additional cost is needed to do this. . .
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paduchuri

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Joined: 03 Jan 2011
Posts: 32
Location: Hyderabad

PostPosted: Tue May 31, 2011 2:18 pm    Post subject: Reply to: Equals option in sort
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Thanks for the information guys.
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