title: Specific data types
body: <p>I'm trying to build a database but i'm struggling with the type of some data.
  Basicly i would like to have something that behave like a combobox : you have several choices but can only choose one.
  Unfortunatly i can't define that in a sql database.
  I came up with the idea to store all the different "choices" in a table and each entries will fill one, leaving 10+ empty field.</p>
  
  <p>Isn't there another method to do this in a cleaner way ?</p>