Question

我正在尝试运行我的数据库但是STUDENTS AND BATCHES表给出了错误：'ORA-00942：表或视图不存在'。我已经尝试将它们按顺序丢弃，但我不知道究竟是什么问题。请原谅我，如果答案很明显，我是批处理的新手

DROP TABLE students;
DROP TABLE batches;

DROP TABLE courses;
DROP TABLE faculty;


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) 
);  

CREATE TABLE courses ( 
ccode     VARCHAR2(10)  CONSTRAINT courses_PK  PRIMARY KEY, 
cname     VARCHAR2(50), 
coursefee NUMBER(6),  
prereq    VARCHAR2(100) 
);

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

Answer 1

首先创建您的教师和课程表。由于批次取决于其中一个表，因此您希望首先创建这些表。

CREATE TABLE courses ( 
ccode     VARCHAR2(10)  CONSTRAINT courses_PK  PRIMARY KEY, 
cname     VARCHAR2(50), 
coursefee NUMBER(6),  
prereq    VARCHAR2(100) 
);

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) 
);

示例：http://sqlfiddle.com/#!4/91909c/1显示表创建的序列

Oracle Batch数据库

1 个答案: