Oracle user_constraints表constraint_type列中的字母代码代表什么?
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06-07-2019 - |
题
select distinct constraint_type from user_constraints;
C
-
C
P
R
U
似乎P表示主键,R表示外键,对吗?什么是U和C?
解决方案 2
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
其他提示
来自 12cR1文件一个>:
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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