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 ;'

我试过取出空格和逗号并添加一些我无法找到的地方。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：

文档＃1064 - 您的SQL语法出错;检查与您的MySQL服务器版本相对应的手册，以获得正确的语法，以便在＆＃39;附近使用。约束主要密钥（StaffID））ENGINE = innodb＆＃39;在第4行

Answer 1

我对MySql并不熟悉，但是有必要在Integer列中添加一个长度吗？你是说第一列的类型是

整数（11）

试图创建表获取错误

1 个答案: