title: How to use "central columns" in phpmyadmin?
body: <p>PMA has the tools for adding the central columns. As far as I understand, it's used with foreign constraints. I have two tables: <code>TableA</code> and <code>TableB</code>.</p>
  
  <p>Structure of <code>TableA</code>: <code>id_of_A</code>, <code>name_of_A_value</code>, <code>...</code></p>
  
  <p>Structure of <code>TableB</code>: <code>id_of_B</code>, <code>foreign_id_of_A</code>,<code>...</code> and foreign constraint from <code>foreign_id_of_A</code> to <code>A-table</code>.<code>id_of_A</code>.</p>
  
  <p>And it's very difficult to select needed <code>foreign_id_of_A</code> while insert new row into <code>TableB</code> because only value of <code>id_of_A</code> is visible. Could central columns help me with this problem? How central column works?</p>