title: Best way for "database specific" sql scripts with Flyway
body: <p>I started to use <code>Flyway</code> in my current project for database migrations and I like it very much. I currently use Oracle in PROD- and Derby in TEST-Environment.</p>
  
  <p>Pretty soon, I did run in the problem of database specific sql commands, e.g. <br></p>
  
  <ul>
  <li><code>ALTER TABLE T1 MODIFY F1 VARCHAR(256);</code> on Oracle vs </li>
  <li><code>ALTER TABLE T1 ALTER F1 SET DATA TYPE VARCHAR(256);</code> on Derby.</li>
  </ul>
  
  <p>I can't see a way to write a "vendor neutral alter table modify column datatype" sql.</p>
  
  <p>What's the best way to deal with this problem using Flyway?</p>