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How is qualified by implemented?

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How is qualified by implemented?

Post  maran on Sat Oct 09, 2010 5:50 pm

Qualified by is a key relation. It is used to qualify a file identifier by one or more variable factors. It
is used to get the nearest, previous or next nearest record based on whether *NEXT or *PREV is
specified. The field redirection should be done in the referring file. The *NEXT is implemented as
SETLL and READ. The *PREVIOUS is implemented as SETGT and READP
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