创建mysql表时出错？

我试图在mysql中创建一个数据库，我的代码的第一部分工作正常，但在以下方面出现语法错误：

创建表项目\u人员( empID INT不为空， projID INT不为空， 约束

我不明白哪里出错了。 这是我的密码：

CREATE TABLE Employees (
    empID INT NOT NULL AUTO_INCREMENT,
    empSurname VARCHAR(255) NOT NULL,
    empLastname VARCHAR(255) NOT NULL,
    empJobtitle VARCHAR(255) NOT NULL,
    empLinemanager VARCHAR(255) NOT NULL,
    CONSTRAINT pk_employees PRIMARY KEY (empID)
) ENGINE=InnoDB;

CREATE TABLE Skills (
    sklID INT NOT NULL AUTO_INCREMENT,
    sklName VARCHAR(255) NOT NULL,
    CONSTRAINT pk_skills PRIMARY KEY (sklID)
) ENGINE = InnoDB;

CREATE TABLE Employees_Skills (
    empskID INT NOT NULL AUTO_INCREMENT,
    empskLevel INT NOT NULL,
    sklID INT NOT NULL,
    empID INT NOT NULL,
    CONSTRAINT fk_employees_skills FOREIGN KEY (sklID) REFERENCES Skills(sklID),
    CONSTRAINT fk_employees_skills_1 FOREIGN KEY (empID)  REFERENCES Employees(empID),
    CONSTRAINT pk_employees_skills PRIMARY KEY (empskID)
) ENGINE = InnoDB;   

CREATE TABLE Project (
    projID INT NOT NULL AUTO_INCREMENT,
    projName VARCHAR(255) NOT NULL,
    projDuration INT NOT NULL,
    projStartdate VARCHAR (255) NOT NULL,
    CONSTRAINT pk_project PRIMARY KEY (projID)
) ENGINE = InnoDB

CREATE TABLE Project_Staff (
    empID INT NOT NULL,
    projID INT NOT NULL,
    CONSTRAINT fk_project_staff FOREIGN KEY (empID) REFERENCES  Employees(empID),
    CONSTRAINT fk_project_staff FOREIGN KEY (projID) REFERENCES Project(projID)
) ENGINE = InnoDB

CREATE TABLE Skill_For_Project (
    sklreqDuration INT NOT NULL,
    projID INT NOT NULL,
    sklID INT NOT NULL,
    CONSTRAINT fk_skill_for_project FOREIGN KEY (sklID) REFERENCES  Skills(empID),
    CONSTRAINT fk_skill_for_project FOREIGN KEY (projID) REFERENCES Project (projID)
) ENGINE = InnoDB

---

在我看来，有两个问题

在

create project table

创建表项目
（projID INT非空自动增量，
约束pk_项目
主键（projID））引擎=InnoDB；

您有重复的密钥名“fk_项目_人员”：

重复的密钥名称“fk\U项目的技能\U”：

在技能表中错误输入empID。您可能对技能项目表中的员工（empID）感兴趣

Create Table语句末尾有未命中分号


这里是完整的工作代码

CREATE TABLE Employees (
empID INT NOT NULL AUTO_INCREMENT,
empSurname VARCHAR(255) NOT NULL,
empLastname VARCHAR(255) NOT NULL,
empJobtitle VARCHAR(255) NOT NULL,
empLinemanager VARCHAR(255) NOT NULL,
CONSTRAINT pk_employees PRIMARY KEY (empID)
) ENGINE=InnoDB;

CREATE TABLE Skills (
sklID INT NOT NULL AUTO_INCREMENT,
sklName VARCHAR(255) NOT NULL,
CONSTRAINT pk_skills PRIMARY KEY (sklID)
) ENGINE = InnoDB;

CREATE TABLE Employees_Skills (
empskID INT NOT NULL AUTO_INCREMENT,
empskLevel INT NOT NULL,
sklID INT NOT NULL,
empID INT NOT NULL,
CONSTRAINT fk_employees_skills FOREIGN KEY (sklID) REFERENCES Skills(sklID),
CONSTRAINT fk_employees_skills_1 FOREIGN KEY (empID)  REFERENCES Employees(empID),
CONSTRAINT pk_employees_skills PRIMARY KEY (empskID)
) ENGINE = InnoDB;   

CREATE TABLE Project (
projID INT NOT NULL AUTO_INCREMENT,
projName VARCHAR(255) NOT NULL,
projDuration INT NOT NULL,
projStartdate VARCHAR (255) NOT NULL,
CONSTRAINT pk_project PRIMARY KEY (projID)
) ENGINE = InnoDB;

CREATE TABLE Project_Staff (
empID INT NOT NULL,
projID INT NOT NULL,
CONSTRAINT fk_project_staff FOREIGN KEY (empID) REFERENCES  Employees(empID),
CONSTRAINT fk_project_staff2 FOREIGN KEY (projID) REFERENCES Project(projID)
) ENGINE = InnoDB;

CREATE TABLE Skill_For_Project (
sklreqDuration INT NOT NULL,
projID INT NOT NULL,
sklID INT NOT NULL,
CONSTRAINT fk_skill_for_project FOREIGN KEY (sklID) REFERENCES  Employees(empID),
CONSTRAINT fk_skill_for_project2 FOREIGN KEY (projID) REFERENCES Project(projID)
) ENGINE = InnoDB;

您得到了什么错误确切的错误是什么？第9行是什么？