The COLLATING SEQUENCE phrase specifies the collating sequence to be used in nonnumeric comparisons for the KEY data items in this merge operation.
If you omit COLLATING SEQUENCE, the PROGRAM COLLATING SEQUENCE clause (if specified) in the OBJECT-COMPUTER paragraph specifies the collating sequence to be used. When you omit both the COLLATING SEQUENCE phrase and the PROGRAM COLLATING SEQUENCE clause, the EBCDIC collating sequence is used.
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