title: Release space deleted 'with no datacopy' in sybase database
body: <p>If  I drop a column from a table in my sybase database, I use the command </p>
  
  <pre><code>ALTER TABLE tableName DROP columnName WITH NO DATACOPY
  </code></pre>
  
  <p>What is the command to actively release the space on the disk of the columns ?</p>
  
  <p>In oracle, the aquivalent command would be </p>
  
  <pre><code>ALTER TABLE tableName DROP UNUSED COLUMNS
  </code></pre>