用scott用户登录：

conn scott/tiger

1. 查看登录用户表的约束

SELECT constraint_name, constraint_type, status, deferrable, deferred
FROM user_constraints

2. 查看所有用户表的约束

SELECT constraint_name, constraint_type, status, deferrable, deferred
FROM all_constraints

3. 查看登录用户约束名称和约束列

SELECT constraint_name, column_name
FROM user_cons_columns

4. 查看所有用户约束名称和约束列

SELECT constraint_name, column_name
FROM all_cons_columns

ITPub博客

查看表的约束