Re: @ versus ~, redux

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От Zeugswetter Andreas DCP SD
Тема Re: @ versus ~, redux
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Msg-id E1539E0ED7043848906A8FF995BDA579014DC301@m0143.s-mxs.net
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Ответ на Re: @ versus ~, redux  (Tom Lane <tgl@sss.pgh.pa.us>)
Ответы Re: @ versus ~, redux  (Tom Lane <tgl@sss.pgh.pa.us>)
Re: @ versus ~, redux  (Bruce Momjian <bruce@momjian.us>)
Список pgsql-hackers
> >> The existing geometric containment tests seem to be nonstrict, so
if
> >> we wanted to leave room to add strict ones later, it might be best
to
> >> settle on
> >>
> >> x @>= y        x contains or equals y
> >> x <=@ y        x is contained in or equals y
> >>
> >> reserving @> and <@ for future strict comparison operators.
>
> > At first glace, it seems more intuitive to me to do:
>
> >     x @>= y        x contains or equals y
> >     x =<@ y        y is contained in or equals y
>
> Hm, I've never seen anyone spell "less than or equal to" as
> "=<", so I'm not sure where you derive "=<@" from?  Not
> saying "no", but the other seems clearer to me.

Yes, but to me too =<@ seems more natural since we started with @> and
<@.
Tom, your argument would more match your original @> and @<, but then it

would imply @>= and @<=, imho.

Andreas


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