Re: repeating groups

From: x <>
Date: Mon, 20 Feb 2006 11:58:10 +0200
Message-ID: <dtc3rk$ti4$>

"Jon Heggland" <> wrote in message

> Can anybody please take half a minute to explain to a poor ignoramus why
> list attributes affects the (relational, I assume(?)) algebra? It seems
> to be taken for granted around here, but I can't figure out how/why.
> What am I missing?

{x:L/ not r(x)} where L is a list of elements from domain D.
{x:D/ r(y) and like(y, [*,'bla',x,*])} or {x:D/ r(y) and y=[*,'bla',x,*]}
{s(x,y):LxL/ r(x) and r(y) and x=[*,'bla',u,*] and y=[*,'bla bla',v,*] and
u=v} Received on Mon Feb 20 2006 - 10:58:10 CET

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