Re: On view updating

alfredo_at_ncs.es (Alfredo Novoa) wrote:

>On Tue, 21 Sep 2004 10:22:25 -0400, "Laconic2" <laconic2_at_comcast.net>
>wrote:
>
>>Surely you can't be serious.
>
>I am.
>
>> To take the phrase "if and only if" in the
>>context of setting the criterion for view updateability, and to say that
>>the "and only if" was redundant and for emphasis is to misread the text.
>
>If I simply say that "a view update can be done if there is PRECISELY
>an unique translation", the "only if" condition is already in the
>meaning of "precisely".

     The condition does not preclude a view update being done under some other circumstance. There is no "only if" there.

Sincerely,

Gene Wirchenko

Computerese Irregular Verb Conjugation:

     I have preferences.
     You have biases.
     He/She has prejudices.