null is a check constraint
v is (I believe) a view constraint
>From: "William Dong" <[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
>Subject: have been wondering for quite a while
>Date: Mon, 02 Jul 2001 12:46:41 -0800
>
>DBAs:
>
>On the user_constraints view, you can find the constraint_type has five
>distinct
>values:
>C, O, P, R, U, and V.
>C=check,
>P=primary key,
>R=foreign key,
>U=unique key.
>What about O and V?
>
>If I assume O=optional(null/not null), I really can not guess V.
>
>Anyone can help?, Thanks in advance.
>
>William
>
>
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>Author: William Dong
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