foreign keys

From: ruben safir <>
Date: Mon, 24 Nov 2014 16:23:22 +0000 (UTC)
Message-ID: <m4vm1q$hja$>

I have this very simple practice database is 11g and I can't add a foreign key to a table. Maybe someone can tell me what I'm doing wrong.

I have table one

create table employee(

        fname varchar2(20) NOT NULL,
        minit char(1),
        lname varchar2(20) NOT NULL,
        ssn number(9) NOT NULL,
        bdate date NOT NULL,
        address varchar2(50) NOT NULL,
        sex char(1) NOT NULL,
        salary float(12) NOT NULL,
        superssn number(9),
        dno number(2)

I set a primary key

alter table employee add constraint pk_employee primary key (ssn) /

I create table two

create table works_on(

                essn number(9),
                pno number(2),
                hours float(5)

ADD CONSTRAINT workson_essn
REFERENCES EMPLOYEE (SSN); SQL> _at_fk_workson_essn.sql
ADD CONSTRAINT workson_essn

ERROR at line 2:
ORA-02298: cannot validate (RUBEN.WORKSON_ESSN) - parent keys not found

what is the error?

The Coin Hangout:
Received on Mon Nov 24 2014 - 17:23:22 CET

Original text of this message