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ORA-02292: ràng buộc toàn vẹn bị vi phạm – bản ghi con được tìm thấy khi tạo thủ tục trong ORACLE SQL Developer?

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ORA-02292: Constraint Violation – Child Records Found

ORA-02292

The incredible assortment of data tables that a user can work with in Oracle can be a blessing and, at times, a curse. Some of the most frustrating Oracle errors occur due to problems with volumes of data being pulled and recorded across multiple table sets, then at various times being manipulated. This action effectively allows a single keystroke to alter information across countless tables.

The ORA-02292 error is a product of this kind of situation. While it may seem a bit overwhelming compared to relatively simpler errors to overcome, such as syntax mistakes, there are a few different approaches that a user can take resolve the error and prevent it from recurring.

The Problem

The ORA-02292 error indicates that an “integrity constraint was violated – child record found”. What this indicates is that the user attempted to delete a record from a parent table (which is referenced by a foreign key), but a record in the child table exists. Before we continue, let us review what a parent-child relationship in Oracle really means.

The foreign key in Oracle provides a means to enforce referential integrity in a database. The table to be referenced is denoted as the “parent table”, which has its own primary key. This primary key matches with the foreign key in the “child table”. The foreign key and integrity constraints are designed for the purpose of maintaining data integrity, which is an adherence to the rules of certain variable levels as specified by a company and enforced by a systems administrator.

Examples of these variable levels are employee numbers or salaries, both of which a company will have specific rules to address The primary key in the parent table serves as the basis for which the levels are enforced.

Now that we have covered this information, let us turn back to the ORA-02292 error and how we can solve and prevent this error.

The Solution

In order to correct the ORA-02292 error, the user will need to update or delete the value into the child table first and subsequently delete the corresponding information in the parent table. Suppose the user created the following foreign key:

CREATE TABLE employer

( employer_id numeric(25) not null,

employer_name varchar2 (100) not null,

contact_name varchar2(100),

CONSTRAINT employer_pk PRIMARY KEY (employer_id)

);

CREATE TABLE employees

( employee_id numeric(25) not null,

employee_id varchar2 (25) not null,

contact_name varchar2(100),

CONSTRAINT employer_fk

FOREIGN KEY (employer_id)

REFERENCES employer (employer_id)

);

From there, the user tries to insert into the employees table the following:

INSERT INTO employer

(employer_id, employer_name, contact_name)

VALUES (525, ‘WALMART’, ‘SAM WALTON’);

INSERT INTO employees

(employee_id, employer_id)

VALUES (600, 525);

Suppose the user then attempted to delete the record from the employer table as follows:

DELETE from employer

WHERE employer_id = 525;

The user would then receive the following Oracle error message:

ORA-02292: integrity constraint (COLLECT.FK_EMPLOYER) violated – child record found

Because the employer_id value of 525 exists in the employees records, the user needs to first delete the record from the employees table:

DELETE from employees

WHERE employer_id = 525;

Then the user can delete from the employer table:

DELETE from employer

WHERE employer_id = 525;

Looking forward

Preventative measures can be taken to avoid an ORA-02292. A constraint can be created that looks like the following:

SQL> alter table emp

2 add (constraint job_fk foreign key (job_key)

3 references job (job_key)

4 on delete cascade);

From here out, when using INSERT or UPDATE for the job key column in the EMP table, the foreign key constraint will check to ensure that the job already exists in the JOB table.

Of course, this type of resolution is much more coding-intensive than would be seen with a syntax issue. If you find that you do not feel comfortable working within your database using this kind of coding on valuable referential tables, it would be advised to contact a licensed Oracle consultant for further information on the process.

SQL deletion of a row returning- “ORA-02292: integrity constraint (..) violated – child record found”

I’ve got a database consisting of four tables. Relation schema as follows in the picture:

And here are the rows:

Now I’m trying to delete the owner with owner id OW1 . Because the id is a primary key in owner table and foreign key in other table its not allowing me to delete the row. Here is the SQL I tried:

delete from owners where ownerid = ‘OW1’ and petid = ‘PT1’

And it returns :

ORA-02292: integrity constraint (TEST_1.ADDRESSES_OWNERS_FK) violated – child record found

And I’m not allowed to set the delete rule to ‘CASCADE’ in relation diagram. Please help 🙁

Tips for ORA-02292 Constraint violation – child records found

Tips for ORA-02292 Constraint violation – child records found Oracle Database Tips by Donald Burleson

Question: I defined a master/slave table with a constraint using the “on delete restrict” clause. When I try to delete a row from the master table I get the Oracle error: ORA-02292: integrity constraint (user….) violated – child record found.

Answer: When you use the “on delete” syntax you have two choices “on delete restrict” and on delete cascade”. The error message will point you to the specific owner and constraint name:

ORA-02292: violated integrity constraint (owner.constraintname)- child record found

You might also see these related errors:

ORA-02290: check constraint (owner.constraintname) violated

ORA-02291: integrity constraint (owner.constraintname) violated – parent key not found

Avoiding ORA-02292 with ON DELETE

This explanation from John Garmany’s book “Easy Oracle SQL” describes the process in detail:

Let’s create the constraint.

SQL> alter table emp

2 add (constraint job_fk foreign key (job_key)

3 references job (job_key)

4 on delete cascade);

Now, when INSERT or UPDATE the job key column in the EMP table, the foreign key constraint will check to insure that the job already exists in the JOB table (or at least the job key exist in the JOB table).

Foreign key constraints can also be disabled, enabled and dropped.

alter table emp disable constraint job_fk;

alter table emp enable constraint job_fk;

alter table emp drop constraint job_fk;

Now, let’s talk about the ON DELETE part of the constraint. When we created the foreign key constraint . we included ON DELETE SET NULL or ON DELETE CASCADE. This clause tells the database what to do with the child records when the parent record is deleted. In the example above, we created the job_fk constraint with ON DELETE CASCADE.

This will cause the database to cascade the deletes. If I go to the JOB table and DELETE a job, all the employees that have that job will also be deleted as the DELETE will cascade to the child rows.

If we use the ON DELETE SET NULL, then when we delete the parent record, the child records with that value will be set to NULL.

So you have finished reading the ora 02292 topic article, if you find this article useful, please share it. Thank you very much. See more: DELETE Oracle, ORA-02291, ORA-02292: integrity constraint violated – child record found Hibernate, Delete Oracle Database, Try catch Oracle, Show constraints Oracle, Exception Oracle, Select foreign key Oracle