title: Firebird default character set
body: <p>SQL select command</p>
  
  <pre><code>SELECT a.RDB$CHARACTER_SET_NAME FROM RDB$DATABASE a
  </code></pre>
  
  <p>returns NULL. What character set is used when not specified any when creating new database? Is there difference between various versions of Firebird (1.0, 2.0, 2.5.1 etc.)?</p>