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how to elliminate duplicates in cobol?

 
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vaibhavjadhav

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Joined: 27 Jul 2007
Posts: 33
Location: mumbai

PostPosted: Tue Oct 23, 2007 2:06 pm    Post subject: how to elliminate duplicates in cobol?
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hi,

can you please tell me how to elliminate the duplicates in a cobol without using any utility.

please provide me with a brief solution.
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enrico-sorichetti

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Joined: 14 Mar 2007
Posts: 10457
Location: italy

PostPosted: Tue Oct 23, 2007 2:23 pm    Post subject: Reply to: how to elliminate duplicates in cobol?
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I guess that the question was asked in the wrong forum !

if the forum is the right one why not use sort

otherwise :
first of all You need to have the records sorted in key order

here is the pseudocode for the main logic:
Code:

( the key could be built from non contiguous fields )
initialize the previous key to low values
do until the end of the input file
   read a record
   build the current key
   if the current key is different from to the previous key then
      write the record
      move the current key to the previous key
   end if
end do
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krisprems

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Joined: 27 Nov 2006
Posts: 649
Location: India

PostPosted: Tue Oct 23, 2007 2:26 pm    Post subject:
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vaibhavjadhav

1. SORT file based on the KEY
2. Start reading the file,
if the previous KEY is equal to current KEY then don't write to the o/p file;
else write to the o/p file.
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