MySQL error cannot add foreign key constraint

Question

what is wrong?

mysql> create table price(
    -> p_code char(1) not null,
    -> p_description varchar(20),
    -> p_rentfee decimal(2,2) not nul         


        

Answer 1

The data type for the child column must match the parent column exactly. For example, since price.p_code is an char(1), movie.p_code also needs to be an char(1) and price.p_code need be a Primary Key or need create a Index.