Re: Restricting the range of values in a field

From: Alex Andriyashchenko <Oleksandr_A_at_yahoo.co.uk>
Date: Fri, 31 Jan 2003 03:33:41 -0800
Message-ID: <F001.00540361.20030131033341@fatcity.com>

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')

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Best regards,

 Alex                            mailto:Oleksandr_A_at_yahoo.co.uk

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Author: Alex Andriyashchenko
  INET: Oleksandr_A_at_yahoo.co.uk

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