Bruce Momjian <br...@momjian.us> writes: > Tom Lane wrote: >> Bruce Momjian <br...@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. regards, tom lane -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers