On Friday 25 June 2004 09:37, Rosser Schwarz wrote: > On Fri, 25 Jun 2004 08:16:47 +0400, sad <[EMAIL PROTECTED]> wrote: > > > Very simply, a boolean may have to values: true or false. It's also > > > possible that it's not been set to anything (NULL). > > > > really ? > > what about (13 < NULL)::BOOL > > Per the semantics of NULL, 13 is neither greater than nor less than > NULL. NULL is the *unknown* value; it's impossible to meaningfully > compare it to anything else. Try (NULL = NULL)::boolean. It's NULL, > also.
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