Oracle ORA-02291:违反完整性约束-未找到父项

这是我的数据库：

CREATE TABLE courses ( 
ccode     VARCHAR2(10)  CONSTRAINT courses_PK  PRIMARY KEY, 
cname     VARCHAR2(50), 
coursefee NUMBER(6)
);

CREATE TABLE faculty (
fcode     VARCHAR2(5)  CONSTRAINT faculty_PK PRIMARY KEY,
name      VARCHAR2(50)
);

CREATE TABLE batches (
bcode varchar2(5) CONSTRAINT batches_PK PRIMARY KEY,   
ccode varchar2(5) CONSTRAINT batches_ccode_FK  REFERENCES COURSES(ccode),  
fcode varchar2(5) CONSTRAINT batches_fcode_FK  REFERENCES FACULTY(fcode),   
stdate date CONSTRAINT batches_stdate_nn not null,  
enddate date,  
timing number(1) CONSTRAINT batches_timing_chk  check( timing in (1,2,3) ),   
CONSTRAINT batches_date_chk check ( stdate <= enddate) 
);   

CREATE TABLE students (
rollno number(5) CONSTRAINT students_PK PRIMARY KEY,   
bcode varchar2(5) CONSTRAINT students_bcode_FK REFERENCES batches(bcode),   
name varchar2(30),
gender char(1) CONSTRAINT students_gender_chk check( upper(gender) in ('M','F')),   
dj date,   
phone varchar2(10),   
email varchar2(30) 
); 

批次表不断出现的错误是： ORA-02290:违反了检查约束（EJAY.BATCHES\u DATE\u CHK）

学生表出现的错误是： ORA-02291:违反完整性约束-未找到父项

我感到困惑的是，它只显示在表中的某些行中。教员和课程都很好，只有这两个。

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如果答案显而易见，我很抱歉，我是初学者。请帮助

批量插入失败，因为您混淆了日期；他们是dd-mm-yy。

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例如，

插入批次值（'D0004'，'D0019'，'D0034'，'08-06-27'，'08-08-11'，3）测试失败
stdate尝试将日期中的年份设置为4位数字？dd-mm-yy不是oracle的日期格式吗？请您解释一下第二句话好吗？标准可能是dd-mm-yy（取决于您的数据库字符集，暂时不用担心）。因此，您不能插入08-06-27和08-08-11，因为2027年的日期比2011年晚，并且您使用批次_date _chk对其进行了约束。如果表批次中没有行，则由于
bcode varchar2（5）约束Students\u bcode\u FK引用批次（bcode）
，Students表中的所有插入都将失败。这意味着Students.bcode的值需要成批显示。bcode，事实并非如此。对不起，我本想说yy-mm-dd，但谢谢你，我会做出更改。如果是yy-mm-dd，它不应该失败；但事实确实如此。这就是为什么我怀疑它实际上是dd-mm-yy（甚至是mm-dd-yy），因为这会导致它失败。这似乎表明它是“yyy-mm-dd”…或“yy-MMM-dd”
INSERT INTO batches VALUES('A0001','A0016','A0031','08-05-13','08-06-17',1); 
INSERT INTO batches VALUES('B0002','E0017','B0032','08-05-13','08-06-26',2); 
INSERT INTO batches VALUES('C0003','C0018','C0033','08-06-27','08-06-28',2); 
INSERT INTO batches VALUES('D0004','D0019','D0034','08-06-27','08-08-11',3);
INSERT INTO batches VALUES('E0005','E0020','E0035','08-07-01','08-08-09',2); 
INSERT INTO batches VALUES('F0006','F0021','F0036','08-07-21','08-08-11',1);
INSERT INTO batches VALUES('G0007','V0022','G0037','08-08-31','08-09-21',3); 
INSERT INTO batches VALUES('H0008','H0023','H0038','08-09-17','08-10-14',3);
INSERT INTO batches VALUES('I0009','I0024','I0039','08-09-23','08-10-20',2); 
INSERT INTO batches VALUES('J0010','P0025','J0040','08-10-04','08-11-26',1);
INSERT INTO batches VALUES('K0011','F0026','K0041','08-10-10','08-11-17',2); 
INSERT INTO batches VALUES('L0012','C0027','L0042','08-11-02','09-02-23',2);
INSERT INTO batches VALUES('M0013','M0028','M0043','08-12-09','09-01-02',3); 
INSERT INTO batches VALUES('N0014','N0029','N0044','08-12-11','09-01-08',3);
INSERT INTO batches VALUES('O0015','O0030','O0045','08-12-15','09-01-12',2); 

INSERT INTO students VALUES(001,'A0001','Andrew Johnson','M','08-01-10','677-0323','AndyJ@hotmail.com');
INSERT INTO students VALUES(002,'B0002','Dionne Peterson','F','08-01-10','324-9705','dionnepet@gmail.com');
INSERT INTO students VALUES(003,'C0003','Sydney Peters','F','08-01-10','624-9664','SydersP@yahoo.com');
INSERT INTO students VALUES(004,'D0004','Tsian Figaro','F','08-09-01','310-4957','tsianfigaro@hotmail.com');
INSERT INTO students VALUES(005,'E0005','Jewel Forbes','F','08-09-01','666-5948','Jewel@gmail.com');
INSERT INTO students VALUES(006,'F0006','Jason Fitzpatrick','M','08-01-02','657-4958','JasonFitz@hotmail.com');
INSERT INTO students VALUES(007,'G0007','Ali Maharaj','M','08-01-02','674-4437','AliMaharaj@gmail.com');
INSERT INTO students VALUES(008,'H0008','Mariah Sunderstone','F','08-01-02','707-4056','mariahS@yahoo.com');
INSERT INTO students VALUES(009,'I0009','Ariah Baron','F','08-01-02','673-9685','AriBar@yahoo.com');
INSERT INTO students VALUES(010,'J0010','Joe Zheng ','M','08-09-01','348-4567','Zhengdo@hotmail.com');
INSERT INTO students VALUES(011,'K0011','Donald Yen','M','08-09-01','328-4749','DonnieYen@gmail.com');
INSERT INTO students VALUES(012,'L0012','Jackson Chang','M','08-08-27','345-6847','JackieChang@yahoo.com');
INSERT INTO students VALUES(013,'M0013','Scott Smith','M','08-01-02','702-9903','Scottsmith@hotmail.com');
INSERT INTO students VALUES(014,'N0014','Michelle Shareef','F','08-02-27','321-0589','michelleShareef@gmail.com');
INSERT INTO students VALUES(015,'O0015','Jean Louis Pierre ','M','08-09-01','428-8378','JLPierre@gmail.com');