code: @Override
  	public int delete(Extensions extensions) throws SQLException {
  
  		DeleteBuilder<Extensions, Void> db = deleteBuilder();
  
  		setUniqueWhere(db.where(), extensions.getExtensionName(), true,
  				extensions.getTableName(), true, extensions.getColumnName());
  
  		int deleted = db.delete();
  
  		return deleted;
  	}
docs: {@inheritDoc}
  
  Delete using the unique columns