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How are datasets concatenated?
Datasets are concatenated by writing a normal DD statement for the first dataset and then adding a DD statement without a DDNAME for ceach dataset to be concatenated in the order they are to be read. The following is an example of three datasets concatenated:
//YEARDAT DD DSN=JAN.DATA.DISP=SHR
// DD DSN=FEB.DATA.DISP=SHR
// DD DSN=MAR.DATA.DISP=SHR
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