外键SQL Server(Foreign Key SQL Server)
我在sql server 2005中创建了一个学生数据库,但它给了我关于外键的错误,请查看其中的问题。
CREATE TABLE STUDENT ( STUDENT_REGNO INT NOT NULL PRIMARY KEY, STUDENT_FIRSTNAME VARCHAR(30) NOT NULL, STUDENT_LASTNAME VARCHAR(20) NOT NULL, STUDENT_FATHER_NAME VARCHAR(30) NOT NULL, STUDENT_EMAIL VARCHAR(20), STUDENT_MOBILE_NO VARCHAR(15), STUDENT_PHONE_NO VARCHAR(15), STUDENT_ADDRESS VARCHAR (40), DEPARTMENT_ID INT CONSTRAINT DEP_1 FOREIGN KEY REFERENCES DEPARTMENT(DEPARTMENT_ID), ACADEMIC_ID INT CONSTRAINT ACDEMIC FOREIGN KEY REFERENCES ACADEMIC(ACADEMIC_ID), CLASS_NAME VARCHAR(20) CONSTRAINT CLASS_1 FOREIGN KEY REFERENCES CLASS(CLASS_NAME) ) CREATE TABLE FACULTY ( FACULTY_ID INT NOT NULL PRIMARY KEY, FACULTY_NAME VARCHAR(20) NOT NULL, FACULTY_FATHER_NAME VARCHAR(30) NOT NULL, FACULTY_EMAIL VARCHAR(20), FACULTY_ADDRESS VARCHAR(40) NOT NULL, FACULTY_MOBILE_NO VARCHAR(30), FACULTY_PHONE_NO VARCHAR(20), FACULTY_QUALIFICATION VARCHAR(20), DEPARTMENT_ID INT CONSTRAINT DEPARTEMNT_2 FOREIGN KEY REFERENCES DEPARTMENT(DEPARTMENT_ID), ACADEMIC_ID INT CONSTRAINT ACADEMIC_1 FOREIGN KEY REFERENCES ACADEMIC(ACADEMIC_ID) ) CREATE TABLE USER1 ( USERNAME VARCHAR(20) NOT NULL, USER_PASSWORD VARCHAR(6) NOT NULL, USER_TYPE VARCHAR(20) NOT NULL, ) CREATE TABLE DEPARTMENT ( DEPARTMENT_ID int NOT NULL PRIMARY KEY, DEPARTMENT_NAME VARCHAR(20) NOT NULL, DEAPRTMENT_OFFICE_NO VARCHAR(20), ) CREATE TABLE CLASS ( CLASS_NAME VARCHAR(20) NOT NULL, CLASS_STRENGTH INT NOT NULL, ) CREATE TABLE ANNOUNCMENT ( ANNOUNCMENT_ID int NOT NULL PRIMARY KEY, ANNOUNCMENT_DESCRIPTION VARCHAR(50), ANNOUNCMENT_TITLE VARCHAR(45) ) CREATE TABLE FORUM ( FORUM_ID int NOT NULL PRIMARY KEY, FORUM_NAME VARCHAR(35) NOT NULL, FORUM_DESCRIPTION VARCHAR(333), FORUM_DISCUSSION VARCHAR(22), POSTED_BY VARCHAR(34) ) CREATE TABLE GRADE ( LETTER_GRADE CHAR NOT NULL , PERCENTAGE FLOAT NOT NULL, STUDENT_REGNO int CONSTRAINT STUDENT_5 FOREIGN KEY(STUDENT) REFERENCES STUDENT(STUDENT_REGNO), COURSE_ID int CONSTRAINT COURSE_1 FOREIGN KEY(COURSE) REFERENCES COURSE(COURSE_ID) ) CREATE TABLE COURSE ( COURSE_NAME VARCHAR(20) NOT NULL, COURSE_CREDIT_HR INT NOT NULL, COURSE_DESCRIPTION VARCHAR(99), ) CREATE TABLE TERM ( TERM_START_DATE DATETIME NOT NULL, TERM_END_DATE DATETIME NOT NULL, student_regno int CONSTRAINT STUDENT_2 FOREIGN KEY(STUDENT) REFERENCES STUDENT(STUDENT_REGNO) ) CREATE TABLE PREVIOUS_ACADEMIC_INFO ( ACADEMIC_ID int NOT NULL PRIMARY KEY, DEGREE_DESCRIPTION VARCHAR(50), CERTIFICATION VARCHAR(30), DURATION DATETIME ) CREATE TABLE TEACHER_COURSE ( AREA_OF_SPECILIZATION VARCHAR(30), faculty_id int CONSTRAINT FACULTY_1 FOREIGN KEY(FACULTY) REFERENCES FACULTY(FACULTY_ID) )
第一个错误是
消息1769,16级,状态1,第65行
外键'STUDENT_5'在引用表'GRADE'时引用了无效的列'STUDENT'。
Msg 1750,Level 16,State 0,Line 65
无法创建约束。 查看以前的错误i am creating a student database in sql server 2005 but it gives me error regarding foreign keys please check whats the problem in it.
CREATE TABLE STUDENT ( STUDENT_REGNO INT NOT NULL PRIMARY KEY, STUDENT_FIRSTNAME VARCHAR(30) NOT NULL, STUDENT_LASTNAME VARCHAR(20) NOT NULL, STUDENT_FATHER_NAME VARCHAR(30) NOT NULL, STUDENT_EMAIL VARCHAR(20), STUDENT_MOBILE_NO VARCHAR(15), STUDENT_PHONE_NO VARCHAR(15), STUDENT_ADDRESS VARCHAR (40), DEPARTMENT_ID INT CONSTRAINT DEP_1 FOREIGN KEY REFERENCES DEPARTMENT(DEPARTMENT_ID), ACADEMIC_ID INT CONSTRAINT ACDEMIC FOREIGN KEY REFERENCES ACADEMIC(ACADEMIC_ID), CLASS_NAME VARCHAR(20) CONSTRAINT CLASS_1 FOREIGN KEY REFERENCES CLASS(CLASS_NAME) ) CREATE TABLE FACULTY ( FACULTY_ID INT NOT NULL PRIMARY KEY, FACULTY_NAME VARCHAR(20) NOT NULL, FACULTY_FATHER_NAME VARCHAR(30) NOT NULL, FACULTY_EMAIL VARCHAR(20), FACULTY_ADDRESS VARCHAR(40) NOT NULL, FACULTY_MOBILE_NO VARCHAR(30), FACULTY_PHONE_NO VARCHAR(20), FACULTY_QUALIFICATION VARCHAR(20), DEPARTMENT_ID INT CONSTRAINT DEPARTEMNT_2 FOREIGN KEY REFERENCES DEPARTMENT(DEPARTMENT_ID), ACADEMIC_ID INT CONSTRAINT ACADEMIC_1 FOREIGN KEY REFERENCES ACADEMIC(ACADEMIC_ID) ) CREATE TABLE USER1 ( USERNAME VARCHAR(20) NOT NULL, USER_PASSWORD VARCHAR(6) NOT NULL, USER_TYPE VARCHAR(20) NOT NULL, ) CREATE TABLE DEPARTMENT ( DEPARTMENT_ID int NOT NULL PRIMARY KEY, DEPARTMENT_NAME VARCHAR(20) NOT NULL, DEAPRTMENT_OFFICE_NO VARCHAR(20), ) CREATE TABLE CLASS ( CLASS_NAME VARCHAR(20) NOT NULL, CLASS_STRENGTH INT NOT NULL, ) CREATE TABLE ANNOUNCMENT ( ANNOUNCMENT_ID int NOT NULL PRIMARY KEY, ANNOUNCMENT_DESCRIPTION VARCHAR(50), ANNOUNCMENT_TITLE VARCHAR(45) ) CREATE TABLE FORUM ( FORUM_ID int NOT NULL PRIMARY KEY, FORUM_NAME VARCHAR(35) NOT NULL, FORUM_DESCRIPTION VARCHAR(333), FORUM_DISCUSSION VARCHAR(22), POSTED_BY VARCHAR(34) ) CREATE TABLE GRADE ( LETTER_GRADE CHAR NOT NULL , PERCENTAGE FLOAT NOT NULL, STUDENT_REGNO int CONSTRAINT STUDENT_5 FOREIGN KEY(STUDENT) REFERENCES STUDENT(STUDENT_REGNO), COURSE_ID int CONSTRAINT COURSE_1 FOREIGN KEY(COURSE) REFERENCES COURSE(COURSE_ID) ) CREATE TABLE COURSE ( COURSE_NAME VARCHAR(20) NOT NULL, COURSE_CREDIT_HR INT NOT NULL, COURSE_DESCRIPTION VARCHAR(99), ) CREATE TABLE TERM ( TERM_START_DATE DATETIME NOT NULL, TERM_END_DATE DATETIME NOT NULL, student_regno int CONSTRAINT STUDENT_2 FOREIGN KEY(STUDENT) REFERENCES STUDENT(STUDENT_REGNO) ) CREATE TABLE PREVIOUS_ACADEMIC_INFO ( ACADEMIC_ID int NOT NULL PRIMARY KEY, DEGREE_DESCRIPTION VARCHAR(50), CERTIFICATION VARCHAR(30), DURATION DATETIME ) CREATE TABLE TEACHER_COURSE ( AREA_OF_SPECILIZATION VARCHAR(30), faculty_id int CONSTRAINT FACULTY_1 FOREIGN KEY(FACULTY) REFERENCES FACULTY(FACULTY_ID) )
and first error is
Msg 1769, Level 16, State 1, Line 65
Foreign key 'STUDENT_5' references invalid column 'STUDENT' in referencing table 'GRADE'.
Msg 1750, Level 16, State 0, Line 65
Could not create constraint. See previous errors
原文:https://stackoverflow.com/questions/5927848
最满意答案
Here is a ruby Bayesian Classifier which can be trained to block certain types of content. It would take some creativity to apply directly to your problem.
Its a commercial service, but SocialMod is worth a mention.
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