ORA-02298: cannot validate (JAVA2S.PRODUCT_ORDER_FK_PRODUCT) - parent keys not found : FOREIGN KEY « Table « Oracle PL/SQL Tutorial

1. Oracle PL/SQL Tutorial
2. Table
3. FOREIGN KEY

SQL>
SQL> CREATE TABLE product (
  2       product_name     VARCHAR2(25) PRIMARY KEY,
  3       product_price    NUMBER(4,2),
  4       quantity_on_hand NUMBER(5,0),
  5       last_stock_date  DATE
  6       );

Table created.

SQL>
SQL> CREATE TABLE product_order (
  2       product_name  VARCHAR2(25),
  3       salesperson   VARCHAR2(3),
  4       order_date DATE,
  5       quantity      NUMBER(4,2)
  6       );

Table created.

SQL>
SQL>
SQL> INSERT INTO product_order VALUES ('Product 1', 'CA', '14-JUL-03', 1);

1 row created.

SQL> INSERT INTO product_order VALUES ('Product 2', 'BB', '14-JUL-03', 75);

1 row created.

SQL> INSERT INTO product_order VALUES ('Product 3', 'GA', '14-JUL-03', 2);

1 row created.

SQL> INSERT INTO product_order VALUES ('Product 4', 'GA', '15-JUL-03', 8);

1 row created.

SQL> INSERT INTO product_order VALUES ('Product 5', 'LB', '15-JUL-03', 20);

1 row created.

SQL> INSERT INTO product_order VALUES ('Product 6', 'CA', '16-JUL-03', 5);

1 row created.

SQL> INSERT INTO product_order VALUES ('Product 7', 'CA', '17-JUL-03', 1);

1 row created.

SQL>
SQL>
SQL> INSERT INTO product VALUES ('Product 1', 99,  1,    '15-JAN-03');

1 row created.

SQL> INSERT INTO product VALUES ('Product 2', 75,  1000, '15-JAN-02');

1 row created.

SQL> INSERT INTO product VALUES ('Product 3', 50,  100,  '15-JAN-03');

1 row created.

SQL> INSERT INTO product VALUES ('Product 4', 25,  10000, null);

1 row created.

SQL> INSERT INTO product VALUES ('Product 5', 9.95,1234, '15-JAN-04');

1 row created.

SQL> INSERT INTO product VALUES ('Product 6', 45,  1,    TO_DATE('December 31, 2008, 11:30 P.M.','Month dd, YYYY, HH:MI P.M.'));

1 row created.

SQL>
SQL> ALTER TABLE product_order
  2       ADD CONSTRAINT product_order_fk_product FOREIGN KEY
  3       (product_name) REFERENCES product;
     ADD CONSTRAINT product_order_fk_product FOREIGN KEY
                    *
ERROR at line 2:
ORA-02298: cannot validate (JAVA2S.PRODUCT_ORDER_FK_PRODUCT) - parent keys not found


SQL>
SQL>
SQL>
SQL> drop table product;

Table dropped.

SQL> drop table product_order;

Table dropped.

SQL>
SQL>
SQL>