我创建了如下所示的表（我使用的是 Oracle XE）。出现的问题是，当我尝试将值插入表中时，出现错误，因为一个外键的值尚未作为另一个主键输入。例如，请参见表 DEPARTMENT 和 EMPLOYEE。下面，连同建表代码，也是数据插入部分。如何绕过这个问题？
CREATE TABLE DEPARTMENT
(
DNAME VARCHAR(10),
DEPTID INTEGER NOT NULL,
MNG_IDNO INTEGER NOT NULL,
PRIMARY KEY (DEPTID)
);
CREATE TABLE EMPLOYEE
(
IDNO INTEGER NOT NULL,
FNAME VARCHAR(10) NOT NULL,
LNAME VARCHAR(10) NOT NULL,
GENDER VARCHAR(6) NOT NULL,
CITY VARCHAR(20),
AREA VARCHAR(20),
STREET VARCHAR(50),
HOUSENO VARCHAR(4),
ZIPCODE INTEGER,
BIRTHDAY DATE,
SALARY INTEGER,
IBAN VARCHAR(34),
DEPT_ID INTEGER NOT NULL,
PRIMARY KEY (IDNO)
);
CREATE TABLE CUSTOMER
(
IDNO INTEGER NOT NULL,
FNAME VARCHAR(10) NOT NULL,
LNAME VARCHAR(10) NOT NULL,
GENDER VARCHAR(6) NOT NULL,
CITY VARCHAR(20),
AREA VARCHAR(20),
STREET VARCHAR(50),
HOUSENO VARCHAR(4),
ZIPCODE INTEGER,
BIRTHDAY DATE,
PRIMARY KEY (IDNO)
);
CREATE TABLE CAR
(
VIN INTEGER NOT NULL,
BRAND VARCHAR(10) NOT NULL,
MODEL VARCHAR(10) NOT NULL,
COLOR VARCHAR(10) NOT NULL,
TRANTYPE VARCHAR(10) NOT NULL,
FUELTYPE VARCHAR(10) NOT NULL,
ENGCC INTEGER NOT NULL,
ENTRYDATE DATE,
PRICE INTEGER NOT NULL,
PAYMENTMETHOD VARCHAR(10) NOT NULL,
DEPT_ID INTEGER NOT NULL,
CUST_IDNO INTEGER NOT NULL,
PRIMARY KEY (VIN)
);
CREATE TABLE CAR_PARTS
(
PARTNUM VARCHAR(25) NOT NULL,
PARTNAME VARCHAR(25) NOT NULL,
COST INTEGER NOT NULL,
PRIMARY KEY (PARTNUM)
);
CREATE TABLE USED_CAR
(
CAR_VIN INTEGER NOT NULL,
MILEAGE INTEGER NOT NULL,
REGDATE DATE NOT NULL,
PRIMARY KEY (CAR_VIN)
);
CREATE TABLE SERVICE
(
DUE_DATE DATE,
ARR_DATE DATE,
COST INTEGER NOT NULL,
SERVICE_NUM INTEGER NOT NULL,
CUST_IDNO INTEGER NOT NULL,
PAYMENTMETHOD VARCHAR(10) NOT NULL,
CAR_VIN INTEGER NOT NULL,
PRIMARY KEY (SERVICE_NUM)
);
CREATE TABLE CUST_PHONUMBER
(
PHONE_NUM INTEGER NOT NULL,
CUST_IDNO INTEGER NOT NULL,
PHONE_TYPE VARCHAR(10),
PRIMARY KEY (CUST_IDNO, PHONE_NUM)
);
CREATE TABLE CAR_DEFECTS
(
DEFECTS VARCHAR(100) NOT NULL,
CAR_VIN VARCHAR(100) NOT NULL,
PRIMARY KEY (DEFECTS, CAR_VIN)
);
CREATE TABLE EMPLOYEE_PHONUMBER
(
PHONENUM INTEGER NOT NULL,
EMPL_IDNO INTEGER NOT NULL,
PRIMARY KEY (PHONENUM, EMPL_IDNO)
);
CREATE TABLE SERVICE_DETAILS
(
SERVICENUM INTEGER NOT NULL,
PROBLEMS VARCHAR(100) NOT NULL,
SOLUTION VARCHAR(100),
PRIMARY KEY (PROBLEMS, SERVICENUM)
);
CREATE TABLE HAS
(
PART_NUM VARCHAR(25) NOT NULL,
CAR_VIN INTEGER NOT NULL,
PRIMARY KEY (PART_NUM, CAR_VIN)
);
CREATE TABLE USES
(
PART_NUM VARCHAR(25) NOT NULL,
SERVICE_NUM INTEGER NOT NULL,
PRIMARY KEY (PART_NUM, SERVICE_NUM)
);
ALTER TABLE DEPARTMENT ADD FOREIGN KEY (MNG_IDNO) REFERENCES EMPLOYEE(IDNO);
ALTER TABLE EMPLOYEE ADD FOREIGN KEY (DEPT_ID) REFERENCES DEPARTMENT(DEPTID);
ALTER TABLE CAR ADD FOREIGN KEY (DEPT_ID) REFERENCES DEPARTMENT(DEPTID);
ALTER TABLE CAR ADD FOREIGN KEY (CUST_IDNO) REFERENCES CUSTOMER(IDNO);
ALTER TABLE SERVICE ADD FOREIGN KEY (CUST_IDNO) REFERENCES CUSTOMER(IDNO);
ALTER TABLE SERVICE ADD FOREIGN KEY (CAR_VIN) REFERENCES CAR(VIN);
ALTER TABLE USED_CAR ADD FOREIGN KEY (CAR_VIN) REFERENCES CAR(VIN);
ALTER TABLE HAS ADD FOREIGN KEY (PART_NUM) REFERENCES CAR_PARTS(PARTNUM);
ALTER TABLE HAS ADD FOREIGN KEY (CAR_VIN) REFERENCES CAR(VIN);
ALTER TABLE USES ADD FOREIGN KEY (PART_NUM) REFERENCES CAR_PARTS(PARTNUM);
ALTER TABLE USES ADD FOREIGN KEY (SERVICE_NUM) REFERENCES SERVICE(SERVICE_NUM);
ALTER TABLE CUSTOMER_PHONUMBER ADD FOREIGN KEY (CUST_IDNO) REFERENCES CUSTOMER(IDNO);
ALTER TABLE EMPLOYEE_PHONUMBER ADD FOREIGN KEY (EMPL_IDNO) REFERENCES EMPLOYEE(IDNO);
ALTER TABLE SERVICE_DETAILS ADD FOREIGN KEY (SERVICENUM) REFERENCES SERVICE(SERVICE_NUM);
数据插入：
INSERT INTO EMPLOYEE VALUES (1234,'ANTREAS','GEORGIOU','MALE','NICOSIA','STROVOLOS','PANAYIAS','12',2682,TO_DATE('01.01.1989', 'DD.MM.YYYY'),5000,9999999,1);
INSERT INTO EMPLOYEE VALUES (1235,'KOSTAS', 'KOSTA', 'MALE', 'NICOSIA','STROVOLOS','VIZANTIOU','12',2064,TO_DATE('01.02.1980', 'DD.MM.YYYY'),5000,9999998,2);
INSERT INTO EMPLOYEE VALUES (1236,'MARIA', 'ANTREOU', 'FEMALE', 'NICOSIA','EGKOMI','TSAROU','12',2522,TO_DATE('05.05.1988', 'DD.MM.YYYY'),5000,9999995,3);
INSERT INTO EMPLOYEE VALUES (1237,'GEORGIA', 'ANTREOU', 'FEMALE', 'NICOSIA','EGKOMI','TSAROU','13',2522,TO_DATE('05.05.1978', 'DD.MM.YYYY'),5000,9999996,4);
INSERT INTO DEPARTMENT VALUES ('SERVICE',1,1234);
INSERT INTO DEPARTMENT VALUES ('SALES',2,1235);
INSERT INTO DEPARTMENT VALUES ('ACCOUNTING',3,1236);
INSERT INTO DEPARTMENT VALUES ('MANAGEMENT',4,1237);
INSERT INTO CUSTOMER VALUES (4321, 'ANTREAS', 'ANTREOU','MALE','PAFOS','GEROSKIPOU','VIZANTIOU','3',2525,TO_DATE('04.04.1954','DD.MM.YYYY'));
INSERT INTO CUSTOMER VALUES (4322, 'MARIA', 'ANTREOU','FEMALE','PAFOS','GEROSKIPOU','VIZANTIOU','7',2525,TO_DATE('03.03.1953','DD.MM.YYYY'));
INSERT INTO CUSTOMER VALUES (4323, 'KOSTAS', 'ANTREOU','MALE','PAFOS','GEROSKIPOU','VIZANTIOU','3',2525,TO_DATE('04.04.1970','DD.MM.YYYY'));
INSERT INTO CUSTOMER VALUES (4324, 'ELENA', 'ANTREOU','MALE','PAFOS','GEROSKIPOU','VIZANTIOU','3',2252,TO_DATE('04.04.1985','DD.MM.YYYY'));
INSERT INTO CUSTOMER VALUES (4325, 'MARIOS', 'ANTREOU','MALE','PAFOS','GEROSKIPOU','VIZANTIOU','3',2525,TO_DATE('04.04.1987','DD.MM.YYYY'));
INSERT INTO CAR VALUES (1111111111, 'MAZDA', '3', 'BLUE', 'MANUAL', 'PETROL', 1600, TO_DATE('08.01.2013','DD.MM.YYYY'), 5000, 'CASH', 2, 4321);
INSERT INTO CAR VALUES (2222222222, 'TOYOTA', 'COROLLA','BLACK', 'MANUAL','PETROL',1600,TO_DATE('08.01.2013','DD.MM.YYYY'),7000,'FINANCE',2,4322);
INSERT INTO CAR VALUES (3333333333, 'TOYOTA', 'HILUX', 'GRAY', '4X4', 'DIESEL', 2500, TO_DATE('08.01.2013','DD.MM.YYYY'), 10000, 'CASH', 2 , 4325);
INSERT INTO CAR VALUES (4444444444, 'HONDA', 'CIVIC', 'BLACK', 'MANUAL', 'PETROL', 1300, TO_DATE('08.01.2013','DD.MM.YYYY'), 3000,'CASH', 2, 4323);
INSERT INTO CAR VALUES (5555555555, 'HONDA', 'INSIGHT', 'WHITE', 'AUTO', 'PETROL', 1500, TO_DATE('08.01.2013','DD.MM.YYYY'), 20000, 'FINANCE', 2, 4324);
INSERT INTO CAR_PARTS VALUES ('A20005B', 'RIGHT FRONT AXLE', 200);
INSERT INTO CAR_PARTS VALUES ('C15220C', 'AIR FILTER', 50);
INSERT INTO CAR_PARTS VALUES ('V99T', 'ENGINE GASKET', 80);
INSERT INTO CAR_PARTS VALUES ('A20004B', 'LEFT FRONT AXLE', 200);
INSERT INTO CAR_PARTS VALUES ('U9P002', 'INTAKE MANIFOLD', 300);
INSERT INTO USED_CAR VALUES (4444444444, 25000, TO_DATE('02.02.2000','DD.MM.YYYY'));
INSERT INTO USED_CAR VALUES (5555555555, 122000, TO_DATE('05.08.2003','DD.MM.YYYY'));
INSERT INTO SERVICE VALUES (TO_DATE('12.01.2013','DD.MM.YYYY'), TO_DATE('01.01.2013','DD.MM.YYYY'), 300, 0001, 4321, 'CASH', 1111111111);
INSERT INTO CUST_PHONUMBER VALUES (99123456, 4321, 'MOBILE');
INSERT INTO CUST_PHONUMBER VALUES (99849563, 4322, 'MOBILE');
INSERT INTO CUST_PHONUMBER VALUES (22568988, 4323, 'LANDLINE');
INSERT INTO CUST_PHONUMBER VALUES (25698974, 4324, 'LANDLINE');
INSERT INTO CUST_PHONUMBER VALUES (97584692, 4325, 'MOBILE');
INSERT INTO CAR_DEFECTS VALUES ('BROKEN SIDE MIRRORS|OIL LEAKS', 4444444444);
INSERT INTO CAR_DEFECTS VALUES ('RUSTY PAINT|WORN-OUT CLUTCH', 5555555555);
INSERT INTO EMPLOYEE_PHONUMBER VALUES (97989565, 1234);
INSERT INTO EMPLOYEE_PHONUMBER VALUES (97585858, 1235);
INSERT INTO EMPLOYEE_PHONUMBER VALUES (96525263, 1236);
INSERT INTO EMPLOYEE_PHONUMBER VALUES (97484852, 1237);
INSERT INTO SERVICE_DETAILS VALUES (0001, 'BROKEN FRONT RIGHT AXLE', 'REPLACED FRONT RIGHT AXLE');
INSERT INTO HAS VALUES ('A20005B', 1111111111);
INSERT INTO HAS VALUES ('A20004B', 1111111111);
INSERT INTO USES VALUES ('A20005B', 0001);