mysql - 尝试创建表时出错

Question

我找不到语法错误:

Drop Table if Exists Classes;
Drop Table if Exists Grades;
Drop Table if Exists Faculty;
Drop Table if Exists Students;

CREATE TABLE Faculty (StaffID INTEGER( 11 ),
StaffFirstName VARCHAR( 50 ),
StaffLastName VARCHAR( 50 ),
StaffPhone VARCHAR, CONSTRAINT PRIMARY KEY (StaffID) ) ENGINE = innodb;

CREATE TABLE Students (
  StudentID INTEGER( 11 ) NOT NULL ,
   StudentFirstName VARCHAR( 50 ) NOT NULL ,
   StudentLastName VARCHAR( 50 ) NOT NULL ,
   StudentPhone VARCHAR NOT NULL,
   CONSTRAINT PRIMARY KEY (StudentID)
  ) ENGINE = innodb ;

 CREATE TABLE Classes (
  ClassID VARCHAR NOT NULL ,
  ClassName VARCHAR( 50 ) NOT NULL ,
  CONSTRAINT PRIMARY KEY (ClassID)
) ENGINE = innodb ;

 CREATE TABLE Grades (
 StaffID INTEGER( 11 ) NOT NULL ,  
 StudentID INTEGER( 11 ) NOT NULL ,
 ClassID VARCHAR (11)NOT NULL ,
   Grade VARCHAR( 2 ),  
   CONSTRAINT PRIMARY KEY (StaffID, StudentID, ClassID),
 FOREIGN KEY (StaffID) references Faculty(StaffID),
 FOREIGN KEY (StudentID) references Students(StudentID),
 FOREIGN KEY (ClassID) references Classes(ClassID)
 ) ENGINE = innodb ;'

我试过去掉空格和逗号并添加一些但我找不到位置。这是错误:

CREATE TABLE Faculty (StaffID INTEGER( 11 ),
StaffFirstName VARCHAR( 50 ),
StaffLastName VARCHAR( 50 ),
StaffPhone VARCHAR, CONSTRAINT PRIMARY KEY (StaffID) ) ENGINE = innodb;

MySQL 说:

Documentation #1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ' CONSTRAINT PRIMARY KEY (StaffID) ) ENGINE = innodb' at line 4

Answer 1

我对MySql不是很熟悉，但是有必要给一个Integer列加一个长度吗？你是说第一列是类型

Integer (11)