Re: NULLs in columns referencing foreign keys

On Sat, 26 Apr 1997, David Williams wrote: > ANY CONDITION IR EXPRESSION THAT INVOLVES NULL ALWAYS EVALUATES TO > NULL WHICH IS FALSE. For this discussion, better to say that NULL is not TRUE. Default checks (in the form of "IF f_x THEN" may be read as "IF f_x = TRUE THEN". NULL is neither TRUE nor FALSE, its NULL. -Richard