Oracle user_contraints 테이블의 constraint_type 열에있는 문자 코드는 무엇을 의미합니까?

Oracle user_contraints 테이블의 constraint_type 열에있는 문자 코드는 무엇을 의미합니까?

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select distinct constraint_type from user_constraints;

C
-
C
P
R
U

P는 기본 키를 의미하고 R은 외래 키를 의미합니다. 맞습니까? U와 C는 무엇입니까?

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로부터 12cR1 문서 :

C - Check constraint on a table  
P - Primary key  
U - Unique key  
R - Referential integrity  
V - With check option, on a view  
O - With read only, on a view  
H - Hash expression  
F - Constraint that involves a REF column  
S - Supplemental logging

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Code Description                Acts On Level
---------------------------------------------
C    Check on a table           Column
O    Read Only on a view        Object
P    Primary Key                Object
R    Referential (Foreign Key)  Column
U    Unique Key                 Column
V    Check Option on a view     Object

참고 URL : https://stackoverflow.com/questions/183642/what-do-the-letter-codes-in-oracle-user-contraints-tables-constraint-type-colum