This week I've been using phpMyAdmin for what feels like the first time in
  years. I'm happier at the command line, but needed some graphical
  representation of information and easy ways to export example
  queries for the book I'm working on. I noticed that phpMyAdmin
  now has a Designer tab, which shows relationships between tables
  and allows you to define them.
  
  If your table types don't support foreign keys, you can still
  draw links in here, and phpMyAdmin will show the id fields as
  links to the data they represent, which is quite a nice touch
  (MyISAM doesn't support foreign keys). If your database does
  support foreign keys, then I found this post which explained that you must have an
  index on the column that will …
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