recursive views

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От Michael Meskes
Тема recursive views
Дата
Msg-id 199804161429.QAA19015@gauss.topsystem.de
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Ответы Re: [HACKERS] recursive views  (Bruce Momjian <maillist@candle.pha.pa.us>)
Re: [HACKERS] recursive views  (Bruce Momjian <maillist@candle.pha.pa.us>)
Список pgsql-hackers
I had some time during vacation to thing about postgresql. And here's the
feature I'd really like to see. This one would put us miles in front of all
others: recursive view definitions.

Just one short example:

There is that well-known parent relation: par (parent, child). The view anc
now should list all ancestors:

create view anc as
    select parent as ancestor, child as person from par
    union
    select anc.ancestor as ancestor, par.child as person
    from anc, par
    where anc.person = par.parent;

What do you guys think of this idea? How much work would it be to implement
it?

Michael
--
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