title: How to create a single foreign key that points to a multiple-column primary key?
body: <p>I have created with MySQL 5.5 a table1 with a multiple-column primary key, created from two FLOAT columns. I want to create a table2 with a single foreign key that points to the primary key of table1. </p>
  
  <p>Is it possible? How can I do it, and it's possible / it's fast to do using phpmyadmin GUI?</p>