What all sections are mandatory for an easytrieve program with SORT activity?
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Library, Activity
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Environment, Activity
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Activity
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Environmet, Library
For an Easytrieve program that includes SORT activity, the LIBRARY section is mandatory along with the ACTIVITY section. The LIBRARY section defines the sort fields and criteria. The ENVIRONMENT section is not specifically required for SORT activity, though it may be needed for file definitions in broader context.
An Easytrieve program that performs a SORT activity must include the Library section (to reference the necessary program libraries) and the Activity section (which defines the actual processing steps, including the sort). The Environment section is not mandatory for this purpose, which is why 'Library, Activity' is the correct pair.