在更新表的主鍵欄位或DELETE資料時，如果遇到ORA-02292: integrity constraint (xxxx) violated - child record found 這個是因為主外來鍵關係，下面藉助一個小列子來描述一下這個錯誤：

實驗：
--建立主表
SQL> create table student(id number,name nvarchar2(12),constraint pk_student primary key(id));

Table created.

--建立外來鍵約束表
SQL> create table grades(id number ,subject nvarchar2(12),scores number,constraint pk_grades primary key(id ,subject),constraint fk_student_id foreign key(id) references student(id));

Table created.

SQL> insert into student values(1001,'kerry');

1 row created.

SQL> insert into student values(1002,'jimmy');

1 row created.

SQL> commit;

Commit complete.

SQL> insert into grades values(1001, 'math', 120);

1 row created.

SQL> insert into grades values(1001, 'english', 106);

1 row created.

SQL> commit;

Commit complete.

--檢視：
SQL> select * from student;

        ID NAME
---------- ------------------------
      1001 kerry
      1002 jimmy

SQL> select * from grades;

        ID SUBJECT                      SCORES
---------- ------------------------ ----------
      1001 math                            120
      1001 english                         106

--更新主表列
SQL> update student set id=1004 where name='kerry';
update student set id=1004 where name='kerry'
*
ERROR at line 1:
ORA-02292: integrity constraint (SYS.FK_STUDENT_ID) violated - child record
found

--報錯，解決：首先找到外來鍵約束和相關表，禁用外來鍵約束，處理資料，然後啟用外來鍵約束：查詢dba_constraints
SQL> col OWNER for a10
SQL> select owner,CONSTRAINT_NAME,TABLE_NAME,SEARCH_CONDITION,VALIDATED from dba_constraints where constraint_name='FK_STUDENT_ID';

OWNER      CONSTRAINT_NAME                TABLE_NAME                     SEARCH_CONDITION               VALIDATED
---------- ------------------------------ ------------------------------ ------------------------------ -------------
SYS        FK_STUDENT_ID                  GRADES                                                         VALIDATED

SQL>

--disable約束：
SQL> alter table sys.grades disable constraint FK_STUDENT_ID;

Table altered.

SQL>
SQL> update student set id=1004 where name='kerry';

1 row updated.

SQL> commit;

Commit complete.

SQL> update grades set id=1004 where id =1001;

2 rows updated.

SQL> commit;

Commit complete.

--修改完後，再enable約束：
SQL> alter table sys.grades enable constraint FK_STUDENT_ID;

Table altered.

--檢視：
SQL> select * from student;

        ID NAME
---------- ------------------------
      1004 kerry
      1002 jimmy

SQL> select * from grades;

        ID SUBJECT                      SCORES
---------- ------------------------ ----------
      1004 math                            120
      1004 english                         106

SQL>

---如果是刪除資料遇到這種情況，可以先刪除子表資料，然後刪除父表資料，如下：
SQL> delete from student where id=1004;
delete from student where id=1004
*
ERROR at line 1:
ORA-02292: integrity constraint (SYS.FK_STUDENT_ID) violated - child record found

--先刪除子表中相關列資料，
SQL> delete from grades where id in ( select id from student where id=1004);

2 rows deleted.

--再次刪除
SQL> delete from student where id=1004;

1 row deleted.

SQL> commit;

Commit complete.

SQL> select * from student;

        ID NAME
---------- ------------------------
      1002 jimmy

SQL> select * from grades;

no rows selected

SQL>
完結！！！！！！！！！！！！！！1

ORA-02292: integrity constraint (xxxx) violated - child record found

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