Hello Aidan,
Thursday, January 30, 2003, 4:00:40 PM, you wrote:
AW> Is there any way you can specify that the only permissible values (is it
AW> called a domain?) that can be entered in varchar2 field in an Oracle
AW> table to, for example, A, B and C?
AW> We can restrict what values users can enter at the application level,
AW> but it would be nice to be able to also restrict what can be entered at
AW> the database level, in case other means of entering data are ever used
AW> or if the application layer fails, for whatever reason, to trap an
AW> unwanted value.
AW> Thanks
Use CHECK constraint.
Like
ALTER TABLE a1
ADD CONSTRAINT CHECK column1 IN ('A','B','C')
--
Best regards,
Alex mailto:[EMAIL PROTECTED]
__________________________________________________
Do You Yahoo!?
Everything you'll ever need on one web page
from News and Sport to Email and Music Charts
http://uk.my.yahoo.com
--
Please see the official ORACLE-L FAQ: http://www.orafaq.net
--
Author: Alex Andriyashchenko
INET: [EMAIL PROTECTED]
Fat City Network Services -- 858-538-5051 http://www.fatcity.com
San Diego, California -- Mailing list and web hosting services
---------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from). You may
also send the HELP command for other information (like subscribing).
