'on 子句中的未知列'pm1ticket.customer_id'答案

【问题标题】：Unknown column 'pm1ticket.customer_id' in 'on clause'on 子句中的未知列'pm1ticket.customer_id'
【发布时间】：2020-02-13 05:38:07
【问题描述】：

public function flag_history()
    { 
        $res=$this->db->query("SELECT
                pm1ticket.rep_id AS execut,
                pm1ticket.status_id,
                pm1contact_rep.f_name AS fname,
                pm1contact_rep.l_name AS lname,
                pm1ticket.due_date,
                pm1flag_history.id,
                flagid,
                from_id,
                to_id,
                MAX.time,
                ticketID,
                pm1flag_history.rep_id,
                pm1contact_rep.user_name,
                pm1contact_rep.f_name,
                pm1contact_rep.l_name,
                pm1ticket.subject
            FROM
                pm1flag_history
            JOIN pm1contact_rep ON pm1contact_rep.id = pm1flag_history.to_id
            JOIN pm1contact ON pm1contact.id = pm1ticket.customer_id
            JOIN pm1ticket ON pm1ticket.id = pm1flag_history.ticketID
            INNER JOIN(
                SELECT
                    MAX(TIME) AS TIME,
                    ticketID AS tkt
                FROM
                    pm1flag_history
                WHERE
                    from_id = "
                .$this->SESSION->userdata('TechUser_Id')."
                GROUP BY
                    tkt
            ) MAX
            ON
                MAX.tkt = pm1flag_history.ticketID
            WHERE
                from_id = ".$this->SESSION->userdata('TechUser_Id')." AND flagid = 'rep'
            GROUP BY
                ticketID
            ORDER BY
                TIME
            DESC"
        );
        //echo $this->db->last_query();die;
        $result=$res->result_array();
        return $result;
    }

我有一个使用pm1ticket.customer_id 的SQL 查询。但它在“on 子句”中显示未知列“pm1ticket.customer_id”。

如何解决此错误。谁能帮帮我。

【问题讨论】：

标签： javascript php sql codeigniter

【解决方案1】：

请尝试以下代码

在 pm1ticket.id = pm1flag_history.ticketID 上加入 pm1ticket
加入 pm1contact ON pm1contact.id = pm1ticket.customer_id

这两行的顺序是错误的。

public function flag_history()
    { 
        $res=$this->db->query("SELECT
                pm1ticket.rep_id AS execut,
                pm1ticket.status_id,
                pm1contact_rep.f_name AS fname,
                pm1contact_rep.l_name AS lname,
                pm1ticket.due_date,
                pm1flag_history.id,
                flagid,
                from_id,
                to_id,
                MAX.time,
                ticketID,
                pm1flag_history.rep_id,
                pm1contact_rep.user_name,
                pm1contact_rep.f_name,
                pm1contact_rep.l_name,
                pm1ticket.subject
            FROM
                pm1flag_history
            JOIN pm1contact_rep ON pm1contact_rep.id = pm1flag_history.to_id
            JOIN pm1ticket ON pm1ticket.id = pm1flag_history.ticketID
            JOIN pm1contact ON pm1contact.id = pm1ticket.customer_id            
            INNER JOIN(
                SELECT
                    MAX(TIME) AS TIME,
                    ticketID AS tkt
                FROM
                    pm1flag_history
                WHERE
                    from_id = "
                .$this->SESSION->userdata('TechUser_Id')."
                GROUP BY
                    tkt
            ) MAX
            ON
                MAX.tkt = pm1flag_history.ticketID
            WHERE
                from_id = ".$this->SESSION->userdata('TechUser_Id')." AND flagid = 'rep'
            GROUP BY
                ticketID
            ORDER BY
                TIME
            DESC"
        );
        //echo $this->db->last_query();die;
        $result=$res->result_array();
        return $result;
    }

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【讨论】：

对不起，先生，我没有得到你。先生，我不明白我做错了什么。这里只有你需要更改连接查询。它可以正常工作，这不是问题。
你必须先加入'pm1ticket'表才能使用它的列。首先，您首先使用“pm1ticket.customer_id”，然后加入“pm1ticket”表。
在使用它的列之前总是先连接表
您可以为答案投票，然后对其他人有所帮助