CONSTRAINT klausul måste gå inom parentesen:
CREATE TABLE employee_licence_certificate(
emp_id NUMBER(4) REFERENCES employee(emp_id)
, licence_cert_code VARCHAR2(6) REFERENCES licence_certificate(licence_cert_code)
, date_earned DATE NOT NULL
, CONSTRAINT pk_emp_licence PRIMARY KEY(emp_id, licence_cert_code)
);
(referens )