title: Add index to table if it does not exist
body: <p>I want to add an index to a table by using the <code>ALTER</code> syntax, but first check if it already exists on the table, and only add the index if it does not exist.    </p>
  
  <pre><code> ALTER TABLE tableName ADD INDEX IX_Table_XYZ (column1);
  </code></pre>
  
  <p>Is there any way to do this?</p>