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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