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On 27-Oct-2014 14:45 -0500, Hoteltravelfundotcom wrote:
I Created View 'AAA' based on 2 files using UNION.
If file A has 100,000 records and file B has 50,000
Should the join view have 150,000 ? I understand it doesn't actually
'have' them but this is what the DSPFD shows.
Note: A VIEW defined with a UNION, lacking an implicit or explicit
JOIN, is not a "join view"; more appropriately that would be referred to
as a UNION VIEW.
when doing DSPFD the view AAA has 100,000
The Display File Description (DSPFD) *can not know* the effect of a
query; the /logical/ VIEW is merely an encapsulation of a query, for
which /physical/ statistics are unknown.
To show _something_, rather than showing nothing about the underlying
data, the statistics about the /primary/ file [actually the statistics
of the first _dataspace_; notably, the first file may be another VIEW]
of the VIEW are presented. While arguably deceptive information, that
had been the documented effect, similar to a Join LF (JLF) which
although not implemented as the effect of a CQE query is similarly
dynamic; I did\will not research a doc link to provide proof of that
effect, but anyone is free to do so for themselves or to offer a script
that contradicts that effect.
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