Query user_constraints with constraint_type = 'R' : user_constraints « System Tables Data Dictionary « Oracle PL/SQL Tutorial

1. Oracle PL/SQL Tutorial
2. System Tables Data Dictionary
3. user_constraints

SQL>
SQL>
SQL> create table registrations
  2  ( attendee    NUMBER(4)
  3  , course      VARCHAR2(6)
  4  , begindate   DATE
  5  , evaluation  NUMBER(1)) ;

Table created.

SQL>
SQL>
SQL> insert into registrations values (1, 'SQL',date '1999-04-12',4   );

1 row created.

SQL> insert into registrations values (2, 'SQL',date '1999-12-13',NULL);

1 row created.

SQL> insert into registrations values (3, 'SQL',date '1999-12-13',NULL);

1 row created.

SQL> insert into registrations values (4, 'OAU',date '1999-08-10',4   );

1 row created.

SQL> insert into registrations values (5, 'OAU',date '2000-09-27',5   );

1 row created.

SQL> insert into registrations values (6, 'JAV',date '1999-12-13',2   );

1 row created.

SQL> insert into registrations values (7, 'JAV',date '2000-02-01',4   );

1 row created.

SQL> insert into registrations values (8, 'JAV',date '2000-02-01',5   );

1 row created.

SQL> insert into registrations values (9, 'XML',date '2000-02-03',4   );

1 row created.

SQL> insert into registrations values (10,'XML',date '2000-02-03',5   );

1 row created.

SQL> insert into registrations values (1, 'PLS',date '2000-09-11',NULL);

1 row created.

SQL> insert into registrations values (2, 'PLS',date '2000-09-11',NULL);

1 row created.

SQL> insert into registrations values (3, 'PLS',date '2000-09-11',NULL);

1 row created.

SQL>
SQL>
SQL> alter table registrations
  2  add  (entered_by number(4) default 7839 not null);

Table altered.

SQL>
SQL> select table_name
  2  ,      constraint_name
  3  ,      status
  4  ,      r_constraint_name as references
  5  from   user_constraints
  6  where  constraint_type = 'R';

TABLE_NAME                     CONSTRAINT_NAME                STATUS
------------------------------ ------------------------------ --------
REFERENCES
------------------------------
MAP                            SYS_C005794                    ENABLED
SYS_C005791

MAP                            SYS_C005793                    ENABLED
SYS_C005790


SQL>
SQL> drop table registrations;

Table dropped.