INNER JOIN语句中的歧义列 [英] Ambiguous column in INNER JOIN statement

问题描述

我对此感到困惑.我已经搜索过互联网，但仍然让我感到困惑.我有以下表格:

I am getting confused with this. I have searched the internet and it is still confusing me. I have the following tables:

会议:meeting_id，title，chairman，secretary，occurances
房间:room_id，room，date，time，meeting_id

Meetings: meeting_id, title, chairman, secretary, occurances
Rooms: room_id, room, date, time, meeting_id

我希望所有内容都显示在桌子上.我的PHP如下:

I want everything to be displayed on a table. My PHP is as follows:

    <?php

$result = mysql_query("SELECT * FROM Meetings INNER JOIN Rooms ON meeting_id = Rooms.meeting_id")
or die(mysql_error()); ;

if (mysql_num_rows($result) == 0) {
       echo 'There Arent Any Meetings Setup Yet';
    } else {

echo "<table border='0'><table border width=100%><tr><th>Title</th><th>Chairperson</th><th>Secretary</th><th>Terms of Reference</th><th>Occurances</th><th>Room</th><th>Date</th><th>Time</th>";        

while($info = mysql_fetch_array($result))
{

        echo "<tr>";
        echo "<td><br/>" . $info['title']." </td>";
        echo "<td><br/>" . $info['chairperson']. "</td>";
        echo "<td><br/>" . $info['secretary']."</td>";
        echo "<td><br/>" . $info['tof']. "</td>";
        echo "<td><br/>" . $info['occurances']. "</td>";
        echo "<td><br/>" . $info['room']. "</td>";
        echo "<td><br/>" . $info['date']. "</td>";
        echo "<td><br/>" . $info['time']. "</td>";

        }
    }
echo "</tr>";
echo "</table>";


?>

它带有以下错误消息:

on子句中的'meeting_id'列不明确

Column 'meeting_id' in on clause is ambiguous

我试图显示会议表中的所有字段，并且显然只显示会议室，日期和时间.

I am trying to display all the fields from the meetings table and obviously the room, date and time only.

我该如何解决?

推荐答案

您需要定义要从中选择meeting_id的表.

You need to define which table you want meeting_id to be selected from.

例如

`SELECT * FROM Meetings INNER JOIN Rooms ON Meetings.meeting_id = Rooms.meeting_id`

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