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