我是mysql的新手，我正在尝试创建一个成绩簿数据库来跟踪某个班级的成绩。我正在使用Mysql工作台，这是我的代码：
SET @OLD_UNIQUE_CHECKS = @@ UNIQUE_CHECKS，UNIQUE_CHECKS = 0;
SET @OLD_FOREIGN_KEY_CHECKS = @@ FOREIGN_KEY_CHECKS，FOREIGN_KEY_CHECKS = 0;
SET @OLD_SQL_MODE = @@ SQL_MODE，SQL_MODE ='TRADITIONAL';
DROP SCHEMA IF EXISTS nj1368843;
创建模式，如果不是EXISTS nj1368843默认字符集latin1 COLLATE latin1_swedish_ci;
USE nj1368843;
- 表nj1368843。Users
DROP TABLE IF EXISTS nj1368843。Users;
CREATE TABLE IF NOT NOT EXISTS nj1368843。Users（
idUsers INT NOT NULL AUTO_INCREMENT，
UserName VARCHAR（45）NOT NULL，
pw VARCHAR（45）NOT NULL，
PRIMARY KEY（idUsers，UserName，pw））
ENGINE = InnoDB;
INSERT INTO nj1368843。Users（UserName，pw）VALUES（'njack2'，'123'）;
- 表nj1368843。Teachers
DROP TABLE IF EXISTS nj1368843。Teachers;
CREATE TABLE IF NOT NOT EXISTS nj1368843。Teachers（
idTeachers INT NOT NULL，
Lname VARCHAR（45）NULL，
Fname VARCHAR（45）NULL，
Users_idUsers INT NOT NULL，
Users_pw VARCHAR（45）NOT NULL，
PRIMARY KEY（idTeachers），
INDEX fk_Teachers_Users1（Users_idUsers ASC，Users_pw ASC），
约束fk_Teachers_Users1
FOREIGN KEY (`Users_idUsers` , `Users_pw` )
REFERENCES `nj1368843`.`Users` (`idUsers` , `UserName` )
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB;
INSERT INTO nj1368843。Teachers（idTeachers，Lname，Fname，Users_idUsers，Users_pw）价值观（105 ，'Stacey'，'Sheila'，'1'，'123'）;
- 表nj1368843。Schedule
DROP TABLE IF EXISTS nj1368843。Schedule;
CREATE TABLE IF NOT NOT EXISTS nj1368843。Schedule（
course_id INT NOT NULL，
Semester VARCHAR（45）NULL，
Year YEAR NULL，
Teachers_idTeachers INT NOT NULL，
PRIMARY KEY（course_id），
INDEX fk_Grades_Teachers1（Teachers_idTeachers ASC），
约束fk_Grades_Teachers1
FOREIGN KEY (`Teachers_idTeachers` )
REFERENCES `nj1368843`.`Teachers` (`idTeachers` )
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB;
- 表nj1368843。Assignments
DROP TABLE IF EXISTS nj1368843。Assignments;
CREATE TABLE IF NOT NOT EXISTS nj1368843。Assignments（
idAssignments INT NOT NULL，
Assignment 1 INT NULL，
AVG_Grade INT（11）NULL，
Schedule_course_id INT NOT NULL，
PRIMARY KEY（idAssignments），
INDEX fk_Assignments_Schedule1（Schedule_course_id ASC），
约束fk_Assignments_Schedule1
FOREIGN KEY (`Schedule_course_id` )
REFERENCES `nj1368843`.`Schedule` (`course_id` )
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB;
- 表nj1368843。Student
DROP TABLE IF EXISTS nj1368843。Student;
CREATE TABLE IF NOT NOT EXISTS nj1368843。Student（
idStudent INT NOT NULL，
lname VARCHAR（45）NULL，
fname VARCHAR（45）NULL，
Schedule_course_id INT NOT NULL，
Users_idUsers INT NOT NULL，
Users_pw VARCHAR（45）NOT NULL，
Assignments_idAssignments INT NOT NULL，
PRIMARY KEY（idStudent），
INDEX fk_Student_Schedule1（Schedule_course_id ASC），
INDEX fk_Student_Users1（Users_idUsers ASC，Users_pw ASC），
INDEX fk_Student_Assignments1（Assignments_idAssignments ASC），
约束fk_Student_Schedule1
FOREIGN KEY (`Schedule_course_id` )
REFERENCES `nj1368843`.`Schedule` (`course_id` )
ON DELETE NO ACTION
ON UPDATE NO ACTION,
约束fk_Student_Users1
FOREIGN KEY (`Users_idUsers` , `Users_pw` )
REFERENCES `nj1368843`.`Users` (`idUsers` , `UserName` )
ON DELETE NO ACTION
ON UPDATE NO ACTION,
约束fk_Student_Assignments1
FOREIGN KEY (`Assignments_idAssignments` )
REFERENCES `nj1368843`.`Assignments` (`idAssignments` )
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB;
- 表nj1368843。Classes
DROP TABLE IF EXISTS nj1368843。Classes;
CREATE TABLE IF NOT NOT EXISTS nj1368843。Classes（
cid INT NOT NULL，
Name VARCHAR（45）NULL，
Schedule_course_id INT NOT NULL，
PRIMARY KEY（cid），
INDEX fk_Classes_Schedule1（Schedule_course_id ASC），
约束fk_Classes_Schedule1
FOREIGN KEY (`Schedule_course_id` )
REFERENCES `nj1368843`.`Schedule` (`course_id` )
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB;
- 表nj1368843。Teachers
DROP TABLE IF EXISTS nj1368843。Teachers;
CREATE TABLE IF NOT NOT EXISTS nj1368843。Teachers（
idTeachers INT NOT NULL，
Lname VARCHAR（45）NULL，
Fname VARCHAR（45）NULL，
Users_idUsers INT NOT NULL，
Users_pw VARCHAR（45）NOT NULL，
PRIMARY KEY（idTeachers），
INDEX fk_Teachers_Users1（Users_idUsers ASC，Users_pw ASC），
约束fk_Teachers_Users1
FOREIGN KEY (`Users_idUsers` , `Users_pw` )
REFERENCES `nj1368843`.`Users` (`idUsers` , `UserName` )
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB;
SET SQL_MODE = @ OLD_SQL_MODE;
SET FOREIGN_KEY_CHECKS = @ OLD_FOREIGN_KEY_CHECKS;
SET UNIQUE_CHECKS = @ OLD_UNIQUE_CHECKS;
我是从一个错误的图表生成的，我不能在数据库中插入任何信息，因为我得到：
错误1452：无法添加或更新子行：外键约束失败（nj1368843。Teachers，CONSTRAINT fk_Teachers_Users1 FOREIGN KEY（Users_idUsers，{{1参考文献Users_pw（Users，idUsers）在更新时不执行任何操作
SQL语句：
INSERT INTO UserName。nj1368843（Teachers，idTeachers，Lname，Fname，Users_idUsers）价值观（105 ，'Stacey'，'Sheila'，1，'123'）
我尝试了每个人的想法，并查看了一百万次代码，仍然无法找到问题。我无法插入此db.help的任何表中。