Foreign Key Error Oracle
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Parent Keys Not Found Ora-02298
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Oracle Integrity Constraint Violated Child Record Found
ORA-02291: integrity constraint violated-parent key not found tips Oracle Error Tips by Burleson Consulting (S. Karam) The Oracle docs note this on
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the ora-02291 error: ORA-02291: integrity constraint (string.string) violated - parent key not found Cause: A foreign key value has no matching primary key value. Action: Delete the foreign key or add a matching primary key. For an insert statement, this ORA-02291 error is common when you are trying how to find parent table in oracle to insert a child without a matching parent, as defined by a foreign key constraint. In that case, you need to add the parent row to the table and then re-insert your child table row.See the dba_constraints view to find the parent table.To fully understand [primary and foreign key constraints, see the book Easy Oracle Jumpstart, to explain these concepts: Burleson is the American Team Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals. Feel free to ask questions on our Oracle forum. Verify experience! Anyone considering using the services of an Oracle support expert should independently investigate their credentials and experience, and not rely on advertisements and self-proclaimed expertise. All legitimate Oracle experts publish their Oracle qualifications. Errata? Oracle technology is changing and we strive to update our BC Oracle support inform
Server MySQL MariaDB PostgreSQL SQLite MS Office Excel Access Word Web Development HTML CSS Color Picker Languages C Language More ASCII Table Linux UNIX Java Clipart Techie Humor Advertisement Oracle Basics a foreign key value has no matching primary key value. Oracle Advanced Oracle Cursors Oracle Exception Handling Oracle Foreign Keys Disable Foreign Key sql error: 2291, sqlstate: 23000 Drop Foreign Key Enable Foreign Key Foreign Key Foreign Key (cascade) Foreign Key (set null) Oracle Loops/Conditionals Oracle Transactions parent key and foreign key Oracle Triggers String/Char Functions Numeric/Math Functions Date/Time Functions Conversion Functions Analytic Functions Advanced Functions NEXT: Foreign Key (cascade) Oracle / PLSQL: Foreign Keys This Oracle tutorial explains how to use Foreign Keys http://www.dba-oracle.com/t_ora_02291_integrity_constraint_string_string_violated_parent_key_not_found.htm in Oracle with syntax and examples. What is a foreign key in Oracle? A foreign key is a way to enforce referential integrity within your Oracle database. A foreign key means that values in one table must also appear in another table. The referenced table is called the parent table while the table with the foreign key is called the child table. The foreign key https://www.techonthenet.com/oracle/foreign_keys/foreign_keys.php in the child table will generally reference a primary key in the parent table. A foreign key can be defined in either a CREATE TABLE statement or an ALTER TABLE statement. Using a CREATE TABLE statement Syntax The syntax for creating a foreign key using a CREATE TABLE statement is: CREATE TABLE table_name ( column1 datatype null/not null, column2 datatype null/not null, ... CONSTRAINT fk_column FOREIGN KEY (column1, column2, ... column_n) REFERENCES parent_table (column1, column2, ... column_n) ); Example CREATE TABLE supplier ( supplier_id numeric(10) not null, supplier_name varchar2(50) not null, contact_name varchar2(50), CONSTRAINT supplier_pk PRIMARY KEY (supplier_id) ); CREATE TABLE products ( product_id numeric(10) not null, supplier_id numeric(10) not null, CONSTRAINT fk_supplier FOREIGN KEY (supplier_id) REFERENCES supplier(supplier_id) ); In this example, we've created a primary key on the supplier table called supplier_pk. It consists of only one field - the supplier_id field. Then we've created a foreign key called fk_supplier on the products table that references the supplier table based on the supplier_id field. We could also create a foreign key with more than one field as in the example below: CREATE TABLE supplier ( supplier_id numeric(10) not null, supplier_name
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the http://stackoverflow.com/questions/13518246/violated-parent-key-not-found-error company Business Learn more about hiring developers or posting ads with us Stack Overflow http://dba.stackexchange.com/questions/68706/error-creating-foreign-key-in-oracle Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up violated - parent key not found error up vote 0 down vote favorite I have the following error appearing: foreign key INSERT INTO GroupMembers VALUES ('Goldfrat', 'Simon Palm') * ERROR at line 1: ORA-02291: integrity constraint (SHAHA1.IAM_IS_GROUP_FK) violated - parent key not found The constraint in the GroupMembers table is: CONSTRAINT iam_is_group_fk FOREIGN KEY(is_group) REFERENCES Members(group_name) The Members Table looks like this: CREATE TABLE Members ( group_name VARCHAR2(40), CONSTRAINT g_id_pk PRIMARY KEY(group_name), CONSTRAINT m_group_name_fk FOREIGN KEY(group_name) REFERENCES Artist(artistic_name)); All of the tables are created fine until it comes to creating the GroupMembers table. Anyone integrity constraint violated have any ideas? I've been scratching for quite a while. sql database oracle share|improve this question edited Oct 28 '13 at 11:06 Kiquenet 5,0672487148 asked Nov 22 '12 at 18:23 AkshaiShah 75341734 I'm scratching for the error,too. I've disabled the foreign constraint and did some insert and delete actions. After I updated, I could not enable this foreign constraint. It said ORA-02298: cannot validate (PRODUSR.SYS_C0037867) - parent keys not found. But I checked many times and still cannot find out any records not in parent table. –user3572072 Apr 25 '14 at 8:11 add a comment| 3 Answers 3 active oldest votes up vote 2 down vote accepted The problem is that CONSTRAINT iam_is_group_fk FOREIGN KEY(is_group) REFERENCES Members(group_name); references the table Members on the group_name field. This means that the field is_group on the table GroupMembers must have an identical value on the table Members and group_name field. In my opinion this is bad practice. First of all you should have a primary key field on the table GroupMembers. You should not store the names of the group members in the table GroupMembers, but their corresponding id from the table Members. Also the table Members, should look something like this: CREATE TABLE Members ( member_id NUMBER PRIMARY KEY member_name VARCHAR2(40), CONSTRAINT g_id_pk PRIMARY KEY(member_id), CONS
log in tour help Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Database Administrators Questions Tags Users Badges Unanswered Ask Question _ Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Error Creating Foreign Key in Oracle up vote 2 down vote favorite 1 I have 2 tables: PRODUCTS PREFIX SUFFIX ATTR1 ATTR2 ----------------------------------------------------- 001 AAA 50 100 001 BBB 20 300 010 ACC 50 500 100 ABC 10 200 100 CBA 30 200 100 BBB 10 100 OPTIONS PREFIX SUFFIX OPT_CODE ---------------------------------------- 001 AAA A1 001 AAA A2 001 AAA A3 001 BBB A2 001 BBB A1 001 BBB A3 100 ABC A1 100 CBA B1 100 BBB A2 Created with this DDL: create table products ( prefix VARCHAR2(10), suffix VARCHAR2(10), attr1 VARCHAR2(100), attr2 VARCHAR2(100) ) create table options ( prefix VARCHAR2(10), suffix VARCHAR2(10), opt_code VARCHAR2(2) ) I have created a primary key in the products table: alter table products add constraint products_pk primary key (prefix, suffix); and a primary key in the options table: alter table options add constraint options_pk primary key (prefix, suffix, opt_code); When I try and add a foreign key to the options table like so: ALTER TABLE options ADD CONSTRAINT fk_options_products FOREIGN KEY (prefix, suffix) REFERENCES products (prefix, suffix); I am getting this error: SQL Error: ORA-02298: cannot validate (PRODDB.FK_OPTIONS_PRODUCTS) - parent keys not found 02298. 00000 - "cannot validate (%s.%s) - parent keys not found" *Cause: an alter table validating constraint failed because the table has child records. *Action: Obvious I validated that all the child records (in OPTIONS) have entries in the parent table (PRODUCTS) but not all the entries in PRODUCTS have child entries in OPTIONS. My understanding of that error - you get that when you don't have a parent record for a child entry. Am I missing something here? sql oracle foreign-key share|improve this question edited Jun 20 '14 at 20:07 asked Jun 20 '14 at 19:29 skylaneffz 1113 3 What does this query return? SELECT prefix, suffix FROM options MINUS SELECT prefix, suffix FR