On Feb 3, 2008 7:41 PM, Jaime Casanova <[EMAIL PROTECTED]> wrote: > On Feb 3, 2008 7:26 PM, Omar Bettin <[EMAIL PROTECTED]> wrote: > > Probably I am on the wrong place but for me NULL on numbers means 0 or ZERO. > > I know about standards... > > > > NULL means unknown value, ZERO is a known value
NULL represents absence of a value. You get the UNKNOWN truth value if you compare NULL with any data value or another NULL (damn you, 3VL!). ---------------------------(end of broadcast)--------------------------- TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq