difference between internal sort and external sort
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Internal sort is handled by a cobol program using i/p file,work file and o/p file.
Internal sort is when you do any processing you need to recompile the cobol program
External sort is performed through jcl where you provide SORTIN and SORTOUT datasets and its easier to perform this sort as any changes, will require only submitting the jcl.
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COBOL 
