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ORA-02449: unique/primary keys in table referenced by foreign keys error occurs when you try to drop the parent table without removing the foreign key in a parent-child relationship established between two tables. Two tables are created with a parent-child relationship through a foreign key.
ora-02449 uniqueprimary keys in table referenced by foreign keys 주제에 대한 동영상 보기
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#foreignkey #primarykey
sql server link between two tables reference the primary key from parent table to child table using foreign key constraint
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Oracle / PLSQL: ORA-02449 Error Message – TechOnTheNet
ORA-02449: unique/primary keys in table referenced by foreign keys. Cause. You tried to drop a table that is referenced as a parent table by a foreign key.
Source: www.techonthenet.com
Date Published: 9/13/2022
View: 2112
ORA-02449: unique/primary keys in table referenced by …
ORA-02449: unique/primary keys in table referenced by foreign keys when drop tablespace (Doc ID 1920371.1). Last updated on FEBRUARY 02, …
Source: support.oracle.com
Date Published: 1/3/2022
View: 3568
ORA-02449: Solving the DROP TABLE Dilemma – Oratable
SQL> drop table agreement; drop table agreement * ERROR at line 1: ORA-02449: unique/primary keys in table referenced by foreign keys.
Source: www.oratable.com
Date Published: 12/9/2021
View: 4900
unique/primary keys in table referenced by foreign keys – Ispirer
When SQLWays executes the DROP TABLE statements before creating tables, Oracle may return the error ORA-02449. This means that the table cannot be dropped …
Source: doc.ispirer.com
Date Published: 3/25/2021
View: 9490
ORA-02449 Oracle Drop Table Error – Tech Journey
The Oracle error is caused by the attempt to drop a table with unique or primary keys referenced by foreign keys in another table, or in other word, …
Source: techjourney.net
Date Published: 4/12/2021
View: 7372
ORA-02449: unique/primary keys in table … – IT Tutorial
I got “ORA-02449: unique/primary keys in table referenced by foreign keys During Drop Tablespace ” error in Oracle database.
Source: ittutorial.org
Date Published: 2/19/2022
View: 9834
Dropping a table in Oracle SQL – Stack Overflow
If you’re really sure you want to drop the table even though it’s referenced in foreign keys you can force it like this:
Source: stackoverflow.com
Date Published: 3/1/2021
View: 4258
ORA-02449: unique/primary keys in table referenced by …
The error message ORA-02449: unique/primary keys in table referenced by foreign keys is caused by the drop table statement if the table that is attempted to …
Source: renenyffenegger.ch
Date Published: 12/14/2022
View: 6212
How to fix ORA-02449: unique/primary keys in table …
How to fix ORA-02449: unique/primary keys in table referenced by foreign keys after an online redefinition … This is easy to overlook – the …
Source: minimalistic-oracle.blogspot.com
Date Published: 5/1/2021
View: 2821
주제와 관련된 이미지 ora-02449 uniqueprimary keys in table referenced by foreign keys
주제와 관련된 더 많은 사진을 참조하십시오 Primary and Foreign Key Constraint Reference Table Example SQL Server. 댓글에서 더 많은 관련 이미지를 보거나 필요한 경우 더 많은 관련 기사를 볼 수 있습니다.
주제에 대한 기사 평가 ora-02449 uniqueprimary keys in table referenced by foreign keys
- Author: Haritha Computers \u0026 Technology
- Views: 조회수 19,113회
- Likes: 좋아요 176개
- Date Published: 2019. 7. 22.
- Video Url link: https://www.youtube.com/watch?v=-se4RYx3wCs
ORA-02449: unique/primary keys in table referenced by foreign keys – Yawin Tutor
ORA-02449: unique/primary keys in table referenced by foreign keys error occurs when you try to drop the parent table without removing the foreign key in a parent-child relationship established between two tables. Two tables are created with a parent-child relationship through a foreign key. You try to drop the parent table without removing the foreign key.
When two tables create a parent-child relationship, a constraint is created and enforced. If the parent table is dropped, the constraint prevents the table from being dropped. The parent table is required for the existence of the child table. Before removing the parent table, the parent-child relationship should be removed from the constraint.
As long as the child table exists in the parent-child relationship, the parent table cannot be removed. The foreign key column in the child table is reliant on the parent table’s parent key. The child table should be deleted, or the parent-child relation in the parent table should be removed. The parent table cannot be dropped if this condition is not met.
Cause
An attempt was made to drop a table with unique or primary keys referenced by foreign keys in another table.
Action
Before performing the above operations the table, drop the foreign key constraints in other tables. You can see what constraints are referencing a table by issuing the following
command:
SELECT * FROM USER_CONSTRAINTS WHERE TABLE_NAME = “tabnam”;
The Problem
A parent-child relationship is established between two tables in the Oracle database using a foreign key. The reference constraint enforces the parent-child relationship between the two tables. The child table is dependent on the parent table. If the parent table is dropped from a parent-child relationship, the child table cannot exist. The parent table cannot be dropped until the foreign key constraint is removed.
create table dept ( id numeric(5) primary key, name varchar2(100) ); create table employee ( id numeric(5) primary key, name varchar2(100), deptid numeric(5) references dept(id) ); drop table dept;
Error
Error starting at line : 2 in command – drop table dept Error report – ORA-02449: unique/primary keys in table referenced by foreign keys 02449. 00000 – “unique/primary keys in table referenced by foreign keys” *Cause: An attempt was made to drop a table with unique or primary keys referenced by foreign keys in another table. *Action: Before performing the above operations the table, drop the foreign key constraints in other tables. You can see what constraints are referencing a table by issuing the following command: SELECT * FROM USER_CONSTRAINTS WHERE TABLE_NAME = “tabnam”;
Solution 1
The two tables, as well as the constraint name, must be known before dropping the parent table. The SQL below displays the names of the tables involved in the parent-child relationship as well as the names of the foreign key constraints. If you know the name of the foreign key constraint, you may delete it.
select r.constraint_name Foreign_key_constraint, p.owner parent_owner, p.table_name parent_table, pc.column_name parent_column_name, r.owner child_owner, r.table_name child_table, rc.column_name child_colum_name from user_constraints p join user_cons_columns pc on p.owner=pc.owner and p.table_name=pc.table_name and p.constraint_name = pc.constraint_name and p.constraint_type=’P’ join user_constraints r on p.constraint_name=r.r_constraint_name and r.constraint_type=’R’ join user_cons_columns rc on r.owner=rc.owner and r.table_name=rc.table_name and r.constraint_name = rc.constraint_name and r.constraint_type=’R’ where p.table_name=’DEPT’ order by p.owner, p.table_name, pc.column_name, rc.position;
Foreign_key_constraint | parent_owner |parent_table | parent_column_name |child_owner | child_table | child_colum_name SYS_C0012548 HR DEPT ID HR EMPLOYEE DEPTID
Solution 2
The foreign-key constraint is used to establish the parent-child relationship. The foreign key constraint is used to enforce the relationship. The parent-child connection will not exist if the foreign key constraint is removed. The parent table may be dropped.
ALTER TABLE employee DROP CONSTRAINT SYS_C0012548; drop table dept;
Output
Table DEPT created.
Solution 3
If the child table in the parent-child relation is not necessary, it can be removed before the parent table. To begin, all of the child tables should be deleted. The parent tables can be deleted if the child tables do not exist.
drop table employee; drop table dept;
Output
Table EMPLOYEE dropped. Table DEPT dropped.
Solution 4
Oracle will allow you to cascade drop tables in a parent-child relationship. When the parent table is dropped through the cascade option, all of the child tables are also dropped. This command will not be used unless you are well familiar with the database table foreign key relationship. If the constraint are dropped, they can no longer be retrieved from the Oracle database.
drop table dept cascade constraints;
Output
ORA-02449: unique/primary keys in table referenced by foreign keys when drop tablespace
Last updated on FEBRUARY 02, 2022
Symptoms
SQL> DROP TABLESPACE
INCLUDING CONTENTS AND DATAFILES; DROP TABLESPACE
INCLUDING CONTENTS AND DATAFILES *
ERROR at line 1:
ORA-02449: unique/primary keys in table referenced by foreign keys
Changes
Trying to Drop Tablespace
Cause
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ORA-02449: Solving the DROP TABLE Dilemma
ORA-02449: Solving the DROP TABLE Dilemma
Sometimes you want to drop and recreate an Oracle table, and are in a fix because when you issue the DROP command Oracle responds with ORA-02449:
SQL> drop table agreement; drop table agreement * ERROR at line 1: ORA-02449: unique/primary keys in table referenced by foreign keys
Disabling constraints has no effect on ORA-02449, the only resolution is to drop constraints. Which presents another dilemma: the error does not specify which foreign keys are causing this problem, and from which tables.
Luckily, there is a quick workaround to ORA-02449, provided you are ready to heed the risks of the approach along with it.
How do you get past ORA-02449?
The shortest way out of this problem is the CASCADE CONSTRAINTS option (read the note “Cascade Constraints with Caution” listed below, before you try it!)
SQL> drop table agreement cascade constraints; Table dropped.
CASCADE CONSTRAINTS silently forces all related Foreign Key constraints to be dropped at the time of dropping a table.
Cascade Constraints with Caution
When you drop a table with CASCADE CONSTRAINTS, all related Foreign Key constraints get dropped. When you recreate the dropped table, the Foreign Key constraints do not reappear and must be recreated. There is a high risk of messing up referential integrity if the dropped and recreated table has many dependent tables.
To retain the Foreign Key details as-is when the referenced table is dropped and recreated, you will have to do a bit more along with CASCADE CONSTRAINTS to ascertain all the Foreign Keys getting impacted due to DROP TABLE, and recreate them later.
In the next post, we will see how to get a list of Foreign Keys referencing a specified table and how to easily recreate the dropped Foreign Keys.
DROP TABLE Errors, ORA-02449: unique/primary keys in table referenced by foreign keys
Ispirer SQLWays Database Migration Software
DROP TABLE Errors, ORA-02449: unique/primary keys in table referenced by foreign keys
When SQLWays executes the DROP TABLE statements before creating tables, Oracle may return the error ORA-02449. This means that the table cannot be dropped because it is referenced by a FOREIGN KEY constraint.
To drop tables referenced by child tables, you can the CASCADE CONSTRAINTS option in the DROP TABLE statement. For more information, see Dropping Tables.
To generate the CASCADE CONSTRAINTS option for Oracle
ORA-02449 Oracle Drop Table Error
ORA-02449 Oracle Drop Table Error
ORA-02449: unique/primary keys in table referenced by foreign keys
Sometimes when dropping a table in Oracle database by executing DROP TABLE SQL statement, Oracle may return the error ORA-02449 as below:
The Oracle error is caused by the attempt to drop a table with unique or primary keys referenced by foreign keys in another table, or in other word, the table that is referenced as a parent table by a foreign key constraint in a parent-child relationship that established between two tables through a foreign key. Oracle does not allow to drop tables referenced by foreign keys of other tables without specifying the CASCADE CONSTRAINTS option in the DROP TABLE statement, or to drop the parent table without first removing the foreign key.
The solution and workaround for the error when you want to drop tables referenced by child tables, is to use the CASCADE CONSTRAINTS option in the DROP TABLE statement. For example:
DROP TABLE table_name CASCADE CONSTRAINTS;
The CASCADE CONSTRAINTS option in the DROP TABLE SQL statement will drop the FOREIGN KEY constraints of the child tables referenced.
Alternatively, you can manually drop and remove the foreign key key constraints in other tables before performing the DROP TABLE operations on the parent table, drop the foreign key constraints in other tables. To check what constraints are referencing a table in Oracle, use the following command:
SELECT * FROM USER_CONSTRAINTS WHERE TABLE_NAME = “table_name”;
To drop and delete the user constraints in Oracle use the following command in SQL*Plus, Toad or other SQL tools:
ALTER TABLE table_name DROP CONSTRAINT constraint_name;
ORA-02449: unique/primary keys in table referenced by foreign keys During Drop Tablespace
ORA-02449: unique/primary keys in table referenced by foreign keys During Drop Tablespace
I got “ORA-02449: unique/primary keys in table referenced by foreign keys During Drop Tablespace ” error in Oracle database.
ORA-02449: unique/primary keys in table referenced by foreign keys During Drop Tablespace
Details of error are as follows.
SQL> DROP TABLESPACE TBS_USERS INCLUDING CONTENTS AND DATAFILES DROP TABLESPACE TBS_USERS INCLUDING CONTENTS AND DATAFILES * ERROR at line 1: ORA-02449: unique/primary keys in table referenced by foreign keys SQL>
The tablespace still contain dependencies objects (constraints , indexes ) in the different tablespaces.
To check the dependencies objectsi run the following query.
SQL> select owner, constraint_name,table_name,index_owner,index_name from dba_constraints where (index_owner,index_name) in (select owner,index_name from dba_indexes where tablespace_name=’YOUR_TABLESPACE_NAME’);
Then run the following command.
SQl>ALTER TABLE table_name DISABLE CONSTRAINT constraint_name;
And then you can drop the tablespace as follows.
SQL>Drop tablespace
including contents and datafiles cascade constraints; Please note that if this Tablespace contain empty table it will not be viewed in dba_segments because of the new feature deffered segment creation and you can you can user alter table move to move the table to a new TS
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Dropping a table in Oracle SQL
If you’re really sure you want to drop the table even though it’s referenced in foreign keys you can force it like this:
drop table state cascade constraints;
This syntax is defined in the Oracle SQL Reference.
Note that this drops any foreign key relationships. So you will need to recreate them after you have rebuilt the table (and its primary key). Normally this is okay because the most common use case is trashing and re-creating schemas in Development or CI environments.
We can use cascade constraints to make our build scripts easier to maintain. There are two alternatives:
ORA-02449: unique/primary keys in table referenced by foreign keys
Search notes:
The error messageis caused by thestatement if the table that is attempted to be dropped is referenced by one or more tables with foreign keys that reference the to-be-dropped table’s primary key
Remove foreign keys
The following script is quite a brute force attempt to remove all foreign keys which reference a table so that the table can be dropped.
If this script should be used, of course, is in the eye of the beholder.
create table tq84_A ( id number primary key ); create table tq84_B ( id number primary key, id_a references TQ84_A ); alter table tq84_A add id_b references tq84_B; drop table tq84_A; — ORA-02449: unique/primary keys in table referenced by foreign keys — — Brute force! — Remove all foreign key constraints that — refer to table tq84_A. — declare tab_name varchar2(30) := ‘TQ84_A’; begin for r in ( select fk.constraint_name fk_cons_name, fk.table_name fk_tab_name from user_constraints pk join user_constraints fk on pk.constraint_name = fk.r_constraint_name where pk.table_name = tab_name and pk.constraint_type = ‘P’ ) loop — dbms_output.put_line(r.fk_cons_name || ‘: ‘ || r.fk_tab_name); execute immediate ‘alter table ‘ || r.fk_tab_name || ‘ drop constraint ‘ || r.fk_cons_name; end loop; end; / drop table tq84_A; drop table tq84_B;
Minimalistic Oracle: How to fix ORA-02449: unique/primary keys in table referenced by foreign keys after an online redefinition
Minimalistic Oracle contains a collection of practical examples from my encounters with Oracle technologies. When relevant, I also write about other technologies, like Linux or PostgreSQL. Many of the posts starts with “how to” since they derive directly from my own personal experience. My goal is to provide simple examples, so that they can be easily adapted to other situations.
키워드에 대한 정보 ora-02449 uniqueprimary keys in table referenced by foreign keys
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사람들이 주제에 대해 자주 검색하는 키워드 Primary and Foreign Key Constraint Reference Table Example SQL Server
- Primary and Foreign Key
- add Foreign key sql server
Primary #and #Foreign #Key #Constraint #Reference #Table #Example #SQL #Server
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주제에 대한 기사를 시청해 주셔서 감사합니다 Primary and Foreign Key Constraint Reference Table Example SQL Server | ora-02449 uniqueprimary keys in table referenced by foreign keys, 이 기사가 유용하다고 생각되면 공유하십시오, 매우 감사합니다.
