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Usually you have a requirement of removing the duplicate records from a file using SORT with the option SUM FIELDS=NONE

If the requirement is to always have the first record of the input file (out of all duplicates) in the output file, then the EQUALS option will help you in doing it.

EQUALS option preserves the order of the records being read from the input files.

So your SORT card will look like.

SORT FIELDS=(1,80,CH,A),EQUALS
SUM FIELDS=NONE

Important SQL CODES and ABEND CODES
SORT JOIN – TO JOIN TWO FILES BASED ON A KEY
KNOW YOUR MAINFRAME
REXX – INITIAL SETUP
SAS – SAMPLE PROGRAM
SORT – CONVERT PD to ZD IN DISPLAYABLE FORMAT (ZDF)
SORT – Alphanumeric Tests for INCLUDE and OMIT
SORT – EQUALS Option
SORT – PARSE – REFORMAT VARIABLE FIELDS
SORT – FINDREP, IFTHEN and INREC
SORT – JUSTIFY, SQUEEZE and OVERLAY
SORT – LOOKUP AND CHANGE
SORT – CONVERT PD to ZD and BI to ZD
SORT – OUTREC – TRAN
SORT – OUTREC – INSERT ZEROES, BLANKS, STRINGS
SORT – OUTPUT DATASET DCB (LRECL,RECFM,BLKSIZE)
SORT – INCLUDE and OMIT
SORT – Process Order of CONTROL Statements
SORT – How to use VB dataset (VLSHRT)
SORT – EDIT MASK PATTERNS
SORT – EDIT NUMERIC FIELDS (I,T,S)
SORT – EDIT FIRST AND LAST RECORD
SORT – SYMBOLS
SORT – TO REPLACE A CHAR WITH ANOTHER CHAR – ALTSEQ
SORT – SET RETURN CODE ‘04’ IF OUTPUT FILE IS EMPTY
SORT – INREC, INCLUDE and OMIT
SORT – SKIPREC and STOPAFT
SORT – INREC
SORT – SUM FIELDS
SORT – REMOVE DUPLICATES AND WRITE THEM TO XSUM
DFSORT – Informational and Error Messages
SORT JOIN – UNPAIRED RECORDS INDICATOR
SORT JOIN – TO JOIN TWO FILES BASED ON A KEY
SORT JOB – SIMPLE COPY
SORT TIPS
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