Compiles the delete sql statement

def compile(self):
        """Compiles the delete sql statement"""
        sql = ''
        sql += 'DELETE FROM ' + self.dialect.quote_table(self._table)
        if self._where:
            sql += ' WHERE ' + self.compile_condition(self._where)
        if self._order_by:
            sql += ' ' + self.compile_order_by(self._order_by)

        if self._limit:
            sql += ' LIMIT ' + self._limit
        return sql