Re: Types and "join compatibility"
From: paul c <toledobythesea_at_oohay.ac>
Date: Sun, 31 Jul 2005 00:38:52 GMT
Message-ID: <w4VGe.71372$s54.30383_at_pd7tw2no>
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> In the 2nd edition, page 287. IM Prescription 13.
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> Marshall
>
Date: Sun, 31 Jul 2005 00:38:52 GMT
Message-ID: <w4VGe.71372$s54.30383_at_pd7tw2no>
Marshall Spight wrote:
> paul c wrote:
>
>>Marshall Spight wrote: >> >> >>>... >>>(read ":" as "has type"; P for parent, C for child) >>>Relation PR : (a : P) >>>Relation CR : (a : C) >>> >>>What is the type of PR join CR? >>> >>>Date&Darwen's TTM says it's a relation of type (a : P). >>>... >> >>where does it say that?
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> In the 2nd edition, page 287. IM Prescription 13.
>
>
> Marshall
>
well, pardon me, i read (past tense) it the other way! promise i'll look again tomorrow when i'm not into the plonk.
p Received on Sun Jul 31 2005 - 02:38:52 CEST