MySQL Foreign Key Constraint Error 150: Why Can\'t I Create a Foreign Key with Matching Data Types?

MySQL Foreign Key Constraint Error: Errno 150

Problem:

When attempting to create a table with foreign key references, an "Errno 150" error occurs. The data types of the referenced columns and their primary keys appear to be identical.

Code Snippet:

create TABLE Instructors (

ID varchar(10),
First_Name varchar(50) NOT NULL,
Last_Name varchar(50) NOT NULL,
PRIMARY KEY (ID)
);

create table Courses (

Course_Code varchar(10),

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