Re: Declaring Unenforced Constraints

"Laconic2" <laconic2_at_comcast.net> wrote:

[snip]

>> For unique tendencies, it seems that you can only allow 100% confidence in
>> uniqueness tendencies. Am not sure what a partially enforced constraint
>> would do here. Do you have any examples of semi-unique entities?
>
>Sure, first name and last name among students. If you know the first name
>and the last name (including spelling), but you don't know the student ID,
>the user interface should let you take a shot at it, or shouldn't it?

Sure, first name and last name among credit card holders. If you know the first name and the last name (including spelling), but you don't know the credit card number, the user interface should let you take a shot at it, or shouldn't it?

     Are you authorised?

[snip]

Sincerely,

Gene Wirchenko

Computerese Irregular Verb Conjugation:

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