Re: MV Keys
Date: Fri, 3 Mar 2006 08:27:19 +0100
Message-ID: <MPG.1e720e3f9f7c590398977e_at_news.ntnu.no>
In article <1141372781.078243.197630_at_e56g2000cwe.googlegroups.com>,
marshall.spight_at_gmail.com says...
> Jon Heggland wrote:
> >
> > As long as the type of a bunch of values is well-defined, there is
> > indeed no problem---indeed, that makes the two alternatives I outlined
> > equivalent. However, if any attribute is a set (or list), you probably
> > want (for convenience) to treat it as a single value of its constituent
> > type when it contains only one value, I.e. "Jon" = { "Jon" }. A language
> > that does this may exhibit undesirable behaviour in other places; I
> > believe SQL has trouble with table literals because of this.
>
> Can you say more about this? What kind of trouble?
I think Hugh Darwen has written a piece on this. I'll try to dig it up.
-- JonReceived on Fri Mar 03 2006 - 08:27:19 CET