sql - Mysql can't assign foreign key? -

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hi trying make course_code foreign key, inside of module table so: 

create table course ( code char(3) not null, name varchar(30) not null, credits tinyint not null, constraint course_pk primary key (code));  create table module ( code char(2) not null, name varchar(30) not null, cost decimal(8,2) not null, credits tinyint not null, course_code char(3) not null, constraint module_pk primary key (code), constraint module_fk foreign key (course_code)      references course(code));

the module table course_code references course tables code column, cannot seem work, appreciated, thanks!

i don't think makes difference called can't rename 'code' in course table course_code?


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