两张表设置外键约束提示 1215 - Cannot add foreign key constraint

Question

CREATE TABLE t_bookType(
id int primary key auto_increment,
bookTypeName varchar(20),
bookTypeDesc varchar(200)
);

CREATE TABLE t_book(
id int primary key auto_increment,
bookName varchar(20),
anthor varchar(10),
price decimal(6,2),
bookTypeId int,
constraint fk foreign key(bookTypeId)referencest_bookType(id)
);

Answer 1

key(bookTypeId)references 这个references前面的空格呢???