function Join(Table $table, JoinType $join, Condition $condition, $prepend = false)
    {
        $result = $this->Duplicate();
        if ($prepend)
        {
            array_unshift($result->tables, $table);
            array_unshift($result->joins, $join);
            array_unshift($result->conditions, $condition);
        }
        else
        {    
            $result->tables[] = $table;
            $result->joins[] = $join;
            $result->conditions[] = $condition;
        }
        return $result;
    }