On Tue, Oct 27, 2009 at 03:25:02PM +0000, Sam Mason wrote: > If the absolute value of an interval was defined to strip out all the > negation signs you'd get the "wrong" answers out. Oops, forgot another reason! For maths to work (n) and (-(-n)) should evaluate to the same value. Inverting all the signs, as negation does, will ensure that these semantics remain. -- Sam http://samason.me.uk/ -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
