referencing keys oracle, could be foreign key issue - sql

Question

I keep having an issue where I'm trying to load all my tables into a database.
Whenever I try load a table which references "paper_code" I keep getting problem errors, which then don't create the table.
I've been trying to nail out the errors and have got some papers loading, but it seems only the tables that reference papers(paper_code) are having issues.
code:
DROP TABLE contacts;
DROP TABLE gender;
DROP TABLE lecture_location;
DROP TABLE enrols;
DROP TABLE teaches;
DROP TABLE staff;
DROP TABLE student;
DROP TABLE papers;
DROP TABLE departments;
CREATE TABLE departments
(dept_id INT PRIMARY KEY,
dept_location VARCHAR2(25) NOT NULL,
dept_name VARCHAR2(25) NOT NULL);
INSERT INTO departments VALUES
(01, 'ALBANY STREET', 'COMPUTER SCIENCE');
INSERT INTO departments VALUES
(02, 'UNION STREET', 'MUSIC');
INSERT INTO departments VALUES
(03, 'HOWE STREET', 'ANATOMY');
INSERT INTO departments VALUES
(04, 'ANZAC AVENUE', 'THEATRE');
CREATE TABLE papers
(paper_code INT,
EFTS INT NOT NULL,
dept_id INT REFERENCES departments(dept_id),
PRIMARY KEY(paper_code, dept_id));
INSERT INTO papers VALUES
(160, 0.18, 01);
INSERT INTO papers VALUES
(241, 0.18, 02);
INSERT INTO papers VALUES
(344, 0.18, 03);
INSERT INTO papers VALUES
(444, 0.18, 04);
CREATE TABLE student
(student_id INT PRIMARY KEY,
fname CHAR(11) NOT NULL,
lname CHAR(11) NOT NULL,
degree CHAR(15) NOT NULL);
INSERT INTO student VALUES
(172384, 'Michael', 'McDonald', 'BSc');
INSERT INTO student VALUES
(849294, 'Matthew', 'Brockie', 'BA');
INSERT INTO student VALUES
(384583, 'Daniel', 'Anderson', 'BSc');
CREATE TABLE staff
(staff_id INT PRIMARY KEY,
dept_id INT REFERENCES departments(dept_id),
fname CHAR(15) NOT NULL,
lname CHAR(15) NOT NULL);
INSERT INTO staff VALUES
(31, 01, 'Tony', 'Michaels');
INSERT INTO staff VALUES
(32, 01, 'Steph', 'Cardy');
INSERT INTO staff VALUES
(33, 02, 'Alex', 'Freeland');
INSERT INTO staff VALUES
(34, 02, 'Sam', 'Stewart');
INSERT INTO staff VALUES
(35, 03, 'Monique', 'Cardy');
INSERT INTO staff VALUES
(36, 03, 'Bayan', 'Zach');
CREATE TABLE teaches
(paper_code INT,
staff_id INT REFERENCES staff(staff_id),
dept_id INT,
PRIMARY KEY(paper_code, staff_id, dept_id),
FOREIGN KEY (paper_code, dept_id) REFERENCES papers(paper_code, dept_id));
INSERT INTO teaches VALUES
(160, 32, 01);
INSERT INTO teaches VALUES
(241, 31, 01);
INSERT INTO teaches VALUES
(344, 33, 02);
INSERT INTO teaches VALUES
(241, 34, 03);
INSERT INTO teaches VALUES
(444, 35, 03);
INSERT INTO teaches VALUES
(444, 36, 04);
CREATE TABLE enrols
(paper_code INT REFERENCES papers(paper_code),
student_id INT REFERENCES student(student_id),
date_enrolled DATE,
PRIMARY KEY(paper_code, student_id));
INSERT INTO enrols VALUES
(160, 172384, TO_DATE('22-Mar-1994', 'dd-mon-yyyy'));
INSERT INTO enrols VALUES
(444, 849294, TO_DATE('14-Jul-1992', 'dd-mon-yyyy'));
INSERT INTO enrols VALUES
(444, 172384, TO_DATE('23-Mar-1992', 'dd-mon-yyyy'));
INSERT INTO enrols VALUES
(160, 384583, TO_DATE('07-Aug-1992', 'dd-mon-yyyy'));
INSERT INTO enrols VALUES --fix
(160, 172384, TO_DATE('30-Jul-1994', 'dd-mon-yyyy'));
INSERT INTO enrols VALUES
(241, 849294, TO_DATE('08-Sep-1995', 'dd-mon-yyyy'));
INSERT INTO enrols VALUES
(241, 384583, TO_DATE('25-Dec-1996', 'dd-mon-yyyy'));
CREATE TABLE lecture_location
(paper_code INT REFERENCES papers(paper_code),
dept_id INT REFERENCES departments(dept_id),
lecture_loc VARCHAR2(15),
PRIMARY KEY(paper_code, dept_id, lecture_loc));
INSERT INTO lecture_location VALUES
(160, 'ARCHWAY');
INSERT INTO lecture_location VALUES
(241, 'CASTLE');
CREATE TABLE gender
(student_id INT PRIMARY KEY REFERENCES student(student_id),
gender CHAR(9) NOT NULL);
INSERT INTO gender VALUES
(172384, 'Female');
INSERT INTO gender VALUES
(384583, 'Male');
CREATE TABLE contacts
(contact_details INT,
staff_id INT REFERENCES staff(staff_id),
PRIMARY KEY(contact_details, staff_id));
INSERT INTO contacts VALUES
(022017456, 31);
INSERT INTO contacts VALUES
(034737447, 31);
INSERT INTO contacts VALUES
(02285756, 32);
INSERT INTO contacts VALUES
(034735858, 32);
INSERT INTO contacts VALUES
(034552097, 33);
INSERT INTO contacts VALUES
(022867385, 33);
INSERT INTO contacts VALUES
(021495939, 34);
INSERT INTO contacts VALUES
(034993872, 35);
INSERT INTO contacts VALUES
(027459278, 36);
COMMIT;
All the tables except the ones refering paper_code are working.
Errors are:
INSERT INTO teaches VALUES
*
ERROR at line 1:
ORA-02291: integrity constraint (DAANDERSON.SYS_C00623423) violated - parent
key not found
For enrols:
(paper_code INT REFERENCES papers(paper_code),
*
ERROR at line 2:
ORA-02270: no matching unique or primary key for this column-list
For lecture_location
(paper_code INT REFERENCES papers(paper_code),
*
ERROR at line 2:
ORA-02270: no matching unique or primary key for this column-list
Been trying for a few hours and stil can't get to work. Any information appreciated!

Answer 1

When creating your table teaches, you have:
FOREIGN KEY (paper_code, dept_id) REFERENCES papers(paper_code, dept_id));
So every (paper_code, dept_id) must exist as (paper_code, dept_id) in papers.
Your 2nd entry (241, 01) does not exist, nor does your fourth value (241, 03).
(others may be missing, I didn't check them all)
You're also not inserting dept_id values into lecture_location
You have a primary key value duplicated in enrols:
(160, 172384)
This part of enrols:
CREATE TABLE enrols
(paper_code INT REFERENCES papers(paper_code),
is invalid, since you must reference a unique foreign key - and the only unique key on papers is its primary key of (paper_code, dept_id)
Ditto for this part of lecture_location:
(paper_code INT REFERENCES papers(paper_code),
On the bright side, after doing the fixes above the schema actually builds: http://sqlfiddle.com/#!4/5ed2c2