Setting Unique

[Ed Kleban]

>>>> But what happens if you set the unique flag, and the table gets indexed,
>>>> but
>>>> it turns out the value really aren't unique?
>>> 
>>> Valentina refuse add such record.
>> 
>> I'm not sure what that means.  If you have already added all the records and
>> then enable the unique flag, what happens?
> 
> Ah, I see
> 
>> Does Valentina refuse to set the unique flag?
> 
> YES. It will try to build index and fail,
> And set OFF flag again
> 

Ah, good. So I can either look for an error being thrown, and/or test the
state of the Unique flag after setting it.

Great.