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6.2.23 MERGE Statement
The MERGE statement combines two or more identically sequenced files (that is, files that have already been sorted according to an identical set of ascending/descending keys) on one or more keys and makes records available in merged order to an output procedure or output file.
A MERGE statement can appear anywhere in the Procedure Division except in a Declarative Section. 



    ___ Format __________________________________________________________________________________ 
   |                                                                                             |
   |                         <__________________________________________________                 |
   |                                                            <_____________  |                |
   | >>__MERGE__file-name-1____ ____ __ _ASCENDING__ __ _____ ____data-name-1_|_|______________> |
   |                           |_ON_|  |_DESCENDING_|  |_KEY_|                                   |
   |                                                                                             |
   | >__ __________________________________________________ __USING__file-name-2_______________> |
   |    |_ ___________ __SEQUENCE__ ____ __alphabet-name-1_|                                     |
   |      |_COLLATING_|            |_IS_|                                                        |
   |                                                                                             |
   |    <_____________                                                                           |
   | >____file-name-3_|________________________________________________________________________> |
   |                                                                                             |
   | >__ _OUTPUT PROCEDURE__ ____ __procedure-name-1__ _______________________________ _ _____>< |
   |    |                   |_IS_|                    |_ _THROUGH_ __procedure-name-2_| |        |
   |    |                                               |_THRU____|                     |        |
   |    |         <_____________                                                        |        |
   |    |_GIVING____file-name-4_|_______________________________________________________|        |
   |                                                                                             |
   |_____________________________________________________________________________________________|
file-name-1
The name given in the SD entry that describes the records to be merged.
No file-name can be repeated in the MERGE statement.
No pair of file-names in a MERGE statement can be specified in the same SAME AREA, SAME SORT AREA, or SAME SORT-MERGE AREA clause.

X As an IBM extension, any file-names in a MERGE statement can be
X specified in the same SAME RECORD AREA clause.
When the MERGE statement is executed, all records contained in file-name-2, file-name-3,..., are accepted by the merge program and then merged according to the key(s) specified.

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