//構建訊息表子查詢
        $sql = Db::table(DB_PREFIX.'message')
            ->field('a.id,c.title,c.create_time,c.type,a.tab,a.status')
            ->alias('a')
            ->where($my_where)
            ->join(DB_PREFIX.'message_text c', 'a.text_id = c.id','left')
            ->buildSql();

        //構建sys表 union 聯合
        $data = Db::table(DB_PREFIX.'sys_message')
            ->alias('a')
            ->field('a.id,c.title,c.create_time,c.type,a.tab,a.status')
            ->join([[DB_PREFIX . 'message b', 'a.message_id = b.id','left'], [DB_PREFIX . 'message_text c', 'c.id = b.text_id','left']])
            ->union($sql,true)
            ->where($sys_where)
            ->buildSql();

        //獲得查詢結果
        $list = Db::table($data.' as  a')
            ->order('a.create_time desc')
            ->paginate($page,false,['query'=>request()->param()]);
 

利用字查詢 分頁  field 欄位必須一致