Php codeigniter中的MySQL连接两表查询

我有两张桌子，限额和交易

但只能得到销售订单…请帮助我thanx

获取买卖双方的数据

试试这个

    $this->db->limit(100);
    $this->db->order_by('tra.tra_id','DESC');
    $this->db->join('limit_history as sell', '(tra.sell_limit_id = sell.limit_id AND tra.buy_limit_id = buy.limit_id)','left');
    $data['Histroy']= $this->db->get("tbltrancation as tra")->result_array();

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如果存在相同的列名，则需要为它们指定别名以区分它们：

$this->db
    ->select('tra.*, sell.amount as sell_amount, sell.qty as sell_qty, buy.amount as buy_amount, buy.qty as buy_qty')
    ->from('tbltrancation as tra')
    ->join('limit_history as sell', 'tra.sell_limit_id = sell.limit_id', 'left')
    ->join('limit_history as buy', 'tra.buy_limit_id = buy.limit_id', 'left')
    ->order_by('tra.tra_id', 'desc')
    ->limit(100);

$data['Histroy'] = $this->db->get()->result_array();

---

你想要什么？在你的问题中详细说明

$this->db
    ->select('tra.*, sell.amount as sell_amount, sell.qty as sell_qty, buy.amount as buy_amount, buy.qty as buy_qty')
    ->from('tbltrancation as tra')
    ->join('limit_history as sell', 'tra.sell_limit_id = sell.limit_id', 'left')
    ->join('limit_history as buy', 'tra.buy_limit_id = buy.limit_id', 'left')
    ->order_by('tra.tra_id', 'desc')
    ->limit(100);

$data['Histroy'] = $this->db->get()->result_array();