Oracle FAQ Your Portal to the Oracle Knowledge Grid
HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US
 

Home -> Community -> Usenet -> c.d.o.server -> Any way to do "unique or null"?

Any way to do "unique or null"?

From: Roy Smith <roy_at_popmail.med.nyu.edu>
Date: Tue, 08 Sep 1998 11:45:04 -0400
Message-ID: <roy-0809981145040001@qwerky.med.nyu.edu> 





I've got a column which I want to allow to be null, but if there is a
value in it, I want to ensure that value is unique amongst the non-null
entries.  Can a constraint be used to do this?



-- 


Roy Smith <roy_at_popmail.med.nyu.edu>


New York University School of Medicine

Received on Tue Sep 08 1998 - 10:45:04 CDT












Original text of this message













  HOME |
  ASK QUESTION |
  ADD INFO |
  SEARCH |
  E-MAIL US