Oracle自动生成检查约束

Question

当我创建包含非空列的表时,Oracle自动创建检查约束为非null:像这样(从user_constraints视图查询)

NAME                           TYPE SEARCH_CONDITION
------------------------------ ---- ---------------------------------------
SYS_C0036357                   C    "SUPPLIER_ID" IS NOT NULL
SYS_C0036358                   C    "SUPPLIER_NAME" IS NOT NULL

那么,有没有办法知道Oracle(Auto)创建的约束或者用户创建的约束.

谢谢.

Answer 1

您可以查看表(或)中的GENERATED字段.user_constraintsall_constraints

create table t (a number not null, constraint t_pk primary key(a));
select table_name, constraint_name, generated
 from user_constraints
 where table_name = 'T';

得到:

T | CONSTRAINT. | GENERATED
----------------------------
T | SYS_C008425 | GENERATED NAME
T | T_PK        | USER NAME