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Re: [SPAM]Re: Questions about 9.0 release note

Bruce Momjian <bruce@momjian.us>

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From: Bruce Momjian <bruce@momjian.us>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Takahiro Itagaki <itagaki.takahiro@oss.ntt.co.jp>, Robert Haas <robertmhaas@gmail.com>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Date: 2010-04-06T02:16:26Z
Lists: pgsql-hackers

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Tom Lane wrote:
> Bruce Momjian <bruce@momjian.us> writes:
> > Tom Lane wrote:
> >> Bruce Momjian <bruce@momjian.us> writes:
> >>> +     Exclusion constraints ensure that if any two rows are compared on
> >>> +     the specified columns or expressions using the specified operators,
> >>> +     at least one of these operator comparisons will be false. The syntax is:
> >> 
> >> Isn't that phrasing outright incorrect?  Consider nulls.
> 
> > Well, doesn't a comparison returning null really behave as false? 
> > Should I reword it as "not true" or "false or null"?
> 
> Either one.

I used "false or null".

-- 
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com