Oracle user_contraints 表的constraint_type 列中的字母代码代表什么？
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时间：2020-09-10 01:32:38 来源:igfitidea点击:
What do the letter codes in Oracle user_contraints table's constraint_type column stand for?
提问by dacracot
select distinct constraint_type from user_constraints;
C
-
C
P
R
U
Seems P means primary key and R means foreign key, correct? What are U and C?
似乎 P 表示主键，R 表示外键，对吗？什么是 U 和 C？
采纳答案by dacracot
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
回答by user428974
From the 12cR1 documentation:
来自12cR1 文档：
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
