Php 在不同的行而不是同一行上循环显示时

我有三张桌子：

Student - UPN, Name, Year, House
Seclusion_Status - ID, Arrived, FTE, Rebuild, DateTimeAdded, Staff, Student_UPN (fk), Comment
Period_Rating - ID, Slot_ID, Rating, Date, Seclusion_ID (fk)

每个学生可以在隔离状态表中有许多条目，然后在期间分级表中也有许多条目，该表与隔离ID为的隔离状态表链接

我正在运行以下查询，以根据日期从“隔离”状态返回一条记录，然后返回“期间”评级表中与“隔离”状态记录相关的所有记录

$sql="SELECT * FROM Seclusion_Status 
  INNER JOIN Students ON Seclusion_Status.Student_UPN=Students.UPN 
  JOIN Period_Rating ON Seclusion_Status.ID=period_rating.Seclusion_ID
  WHERE period_rating.Date = '$start' 
  ORDER BY Seclusion_Status.DateTimeAdded ASC";
$result=mysql_query($sql);

然后，我使用while循环遍历结果：

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

<tbody>
<tr>            
    <!--Write out the Student name and year group, and set the colour based on their House/College-->
                      <?php if($rows['House'] == 'Acer') {
                      echo '<td width="150px" bgcolor="#003399">' . $rows['Name'] . ' <p>(' . $rows['Year'] . ')</p>' .  '</td>';
                      }else if($rows['House'] == 'Clarus') {    
                      echo '<td width="150px" bgcolor="#FF0000">' . $rows['Name'] . ' <p>(' . $rows['Year'] . ')</p>' .  '</td>';   
                      }else if($rows['House'] == 'Fortis') {    
                      echo '<td width="150px" bgcolor="#02A10C">' . $rows['Name'] . ' <p>(' . $rows['Year'] . ')</p>' .  '</td>';   
                      }else{
                      echo '<td width="150px" bgcolor="#D2D904">' . $rows['Name'] . ' <p>(' . $rows['Year'] . ')</p>' .  '</td>';       
                      }
                      ?>

        <!--Write Out the Staff Name-->
        <td><p><?php echo $rows['Staff']; ?> </p></td>

        <!--Write out the comment and the incident type in brackets-->
        <td width="210px"><p><?php echo $rows['Comment']; ?> (<?php echo $rows['Incident']; ?>) </p></td>

        <!--Start writing out the ratings for Period 1-->
            <form action="P1Append.php?PrimaryID=<?php echo $rows['PrimaryID']; ?>&startdate=<?php echo $start; ?>" method="post">
            <?php 
                if ($rows['Slot_ID'] == P1)
                {
                    if (empty($rows['Rating'])) 
                    {
                        echo '<td><select onchange="this.form.submit()" style=" width:30px; height:30px;font-size:12pt; background-color:white;" type="text" name="P1" id="P1" maxlength="15"   size="1"><option disabled selected></option><option>G</option><option>A</option><option>R</option></td>';
                    }else if ($rows['Rating'] == G)
                    {
                        echo '<td bgcolor="#02A10C">' . $rows['Rating'] . '</td>';
                    }else if ($rows['Rating'] == A)
                    {
                        echo '<td bgcolor="#ff9900">' . $rows['Rating'] . '</td>';
                    }else if ($rows['Rating'] == R)
                    {
                        echo '<td bgcolor="#FF0000">' . $rows['Rating'] . '</td>';
                    }
                }else
                {
                    echo '<td><img src="images\add.png" width="20px"></td>';
                }
            ?>
            </form>

            <!--Start writing out the ratings for Period 2-->
            <form action="P2Append.php?PrimaryID=<?php echo $rows['PrimaryID']; ?>&startdate=<?php echo $start; ?>" method="post">
            <?php 
                if ($rows['Slot_ID'] == P2)
                {
                    if (empty($rows['Rating'])) 
                    {
                        echo '<td><select onchange="this.form.submit()" style=" width:30px; height:30px;font-size:12pt; background-color:white;" type="text" name="P2" id="P2" maxlength="15"   size="1"><option disabled selected></option><option>G</option><option>A</option><option>R</option></td>';
                    }else if ($rows['Rating'] == G)
                    {
                        echo '<td bgcolor="#02A10C">' . $rows['Rating'] . '</td>';
                    }else if ($rows['Rating'] == A)
                    {
                        echo '<td bgcolor="#ff9900">' . $rows['Rating'] . '</td>';
                    }else if ($rows['Rating'] == R)
                    {
                        echo '<td bgcolor="#FF0000">' . $rows['Rating'] . '</td>';
                    }
                    }else
                    {
                    echo '<td><img src="images\add.png" width="20px"></td>';
                }
            ?>
            </form>

然后在表格中显示结果。我遇到的问题是，在period_rating表中有多个条目的地方，每个学生都被复制到不同的行，而不是同一行

这是我用来从while循环中写出数据的代码：

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

<tbody>
<tr>            
    <!--Write out the Student name and year group, and set the colour based on their House/College-->
                      <?php if($rows['House'] == 'Acer') {
                      echo '<td width="150px" bgcolor="#003399">' . $rows['Name'] . ' <p>(' . $rows['Year'] . ')</p>' .  '</td>';
                      }else if($rows['House'] == 'Clarus') {    
                      echo '<td width="150px" bgcolor="#FF0000">' . $rows['Name'] . ' <p>(' . $rows['Year'] . ')</p>' .  '</td>';   
                      }else if($rows['House'] == 'Fortis') {    
                      echo '<td width="150px" bgcolor="#02A10C">' . $rows['Name'] . ' <p>(' . $rows['Year'] . ')</p>' .  '</td>';   
                      }else{
                      echo '<td width="150px" bgcolor="#D2D904">' . $rows['Name'] . ' <p>(' . $rows['Year'] . ')</p>' .  '</td>';       
                      }
                      ?>

        <!--Write Out the Staff Name-->
        <td><p><?php echo $rows['Staff']; ?> </p></td>

        <!--Write out the comment and the incident type in brackets-->
        <td width="210px"><p><?php echo $rows['Comment']; ?> (<?php echo $rows['Incident']; ?>) </p></td>

        <!--Start writing out the ratings for Period 1-->
            <form action="P1Append.php?PrimaryID=<?php echo $rows['PrimaryID']; ?>&startdate=<?php echo $start; ?>" method="post">
            <?php 
                if ($rows['Slot_ID'] == P1)
                {
                    if (empty($rows['Rating'])) 
                    {
                        echo '<td><select onchange="this.form.submit()" style=" width:30px; height:30px;font-size:12pt; background-color:white;" type="text" name="P1" id="P1" maxlength="15"   size="1"><option disabled selected></option><option>G</option><option>A</option><option>R</option></td>';
                    }else if ($rows['Rating'] == G)
                    {
                        echo '<td bgcolor="#02A10C">' . $rows['Rating'] . '</td>';
                    }else if ($rows['Rating'] == A)
                    {
                        echo '<td bgcolor="#ff9900">' . $rows['Rating'] . '</td>';
                    }else if ($rows['Rating'] == R)
                    {
                        echo '<td bgcolor="#FF0000">' . $rows['Rating'] . '</td>';
                    }
                }else
                {
                    echo '<td><img src="images\add.png" width="20px"></td>';
                }
            ?>
            </form>

            <!--Start writing out the ratings for Period 2-->
            <form action="P2Append.php?PrimaryID=<?php echo $rows['PrimaryID']; ?>&startdate=<?php echo $start; ?>" method="post">
            <?php 
                if ($rows['Slot_ID'] == P2)
                {
                    if (empty($rows['Rating'])) 
                    {
                        echo '<td><select onchange="this.form.submit()" style=" width:30px; height:30px;font-size:12pt; background-color:white;" type="text" name="P2" id="P2" maxlength="15"   size="1"><option disabled selected></option><option>G</option><option>A</option><option>R</option></td>';
                    }else if ($rows['Rating'] == G)
                    {
                        echo '<td bgcolor="#02A10C">' . $rows['Rating'] . '</td>';
                    }else if ($rows['Rating'] == A)
                    {
                        echo '<td bgcolor="#ff9900">' . $rows['Rating'] . '</td>';
                    }else if ($rows['Rating'] == R)
                    {
                        echo '<td bgcolor="#FF0000">' . $rows['Rating'] . '</td>';
                    }
                    }else
                    {
                    echo '<td><img src="images\add.png" width="20px"></td>';
                }
            ?>
            </form>

当前返回的内容是：

 Name | Student_UPN | Slot_ID | Rating
---------------------------------------------
John  | 112         | P1      | G
John  | 112         | P2      | R
John  | 112         | P3      | G

我想要的是：

Name | Student_UPN | P1 Rating | P2 Rating | P3 Rating
---------------------------------------------
John  | 112         | G        | R         | R

希望这更有意义

所以在链接的问题之后，我更新了我的查询，但是它仍然不起作用

 $sql="SELECT *
                MAX(case when period_rating.Slot_ID = 'P1' THEN Rating ELSE Null END) 'P1',
                MAX(case when period_rating.Slot_ID = 'P2' THEN Rating ELSE Null END) 'P2',
                MAX(case when period_rating.Slot_ID = 'LF' THEN Rating ELSE Null END) 'LF',
                MAX(case when period_rating.Slot_ID = 'BR' THEN Rating ELSE Null END) 'BR',
                MAX(case when period_rating.Slot_ID = 'P3' THEN Rating ELSE Null END) 'P3',
                MAX(case when period_rating.Slot_ID = 'P4' THEN Rating ELSE Null END) 'P4',
                MAX(case when period_rating.Slot_ID = 'LC' THEN Rating ELSE Null END) 'LC',
                MAX(case when period_rating.Slot_ID = 'P5' THEN Rating ELSE Null END) 'P5',
                MAX(case when period_rating.Slot_ID = 'P6' THEN Rating ELSE Null END) 'P6',
                MAX(case when period_rating.Slot_ID = 'DT' THEN Rating ELSE Null END) 'DT'
            FROM Seclusion_Status
            INNER JOIN Students
                ON Seclusion_Status.Student_UPN=Students.UPN
            INNER JOIN Period_Rating
                ON Seclusion_Status.ID=period_rating.Seclusion_ID
            WHERE period_rating.Date = '$start'
            GROUP BY Seclusion_Status.Student_UPN
            ORDER BY Seclusion_Status.DateTimeAdded ASC";

---

您似乎在正确的轨道上，但是，根据您提供的表结构，max（）函数中的case语句对我来说似乎没有意义：

MAX(case when period_rating.Rating = 'P1' THEN Student END) 'P1'

P1、P2、P3等值似乎在

Slot\u ID

字段中，而不是在Rating字段中

我在您的表结构中没有看到

Student

字段。根据问题中的描述，您希望返回列中的

评级

字段

我会在每个case语句的else分支中放置一个显式的

null

---

一个总体注释：如果您在输出中的

Name

和

Student\u UPN

字段后面，那么用这两列替换选择列表中的

*

，并将它们也列在分组列表中。

好的，因此我最终通过使用以下查询到达了那里：

SELECT seclusion_status.ID, seclusion_status.Arrived, seclusion_status.FTE, seclusion_status.Rebuild, seclusion_status.Text, seclusion_status.DateTimeAdded, seclusion_status.Staff, seclusion_status.Student_UPN, seclusion_status.Incident, seclusion_status.Comment, students.Name, students.UPN, students.Year, students.House, period_rating.ID, period_rating.Slot_ID, period_rating.Rating, period_rating.Date, period_rating.Seclusion_ID,
            GROUP_CONCAT((CASE period_rating.Slot_ID WHEN 'P1' THEN period_rating.Rating ELSE NULL END)) AS Period1_Rating,
            GROUP_CONCAT((CASE period_rating.Slot_ID WHEN 'P2' THEN period_rating.Rating ELSE NULL END)) AS Period2_Rating,
            GROUP_CONCAT((CASE period_rating.Slot_ID WHEN 'LF' THEN period_rating.Rating ELSE NULL END)) AS LF_Rating,
            GROUP_CONCAT((CASE period_rating.Slot_ID WHEN 'BR' THEN period_rating.Rating ELSE NULL END)) AS BR_Rating,
            GROUP_CONCAT((CASE period_rating.Slot_ID WHEN 'P3' THEN period_rating.Rating ELSE NULL END)) AS Period3_Rating,
            GROUP_CONCAT((CASE period_rating.Slot_ID WHEN 'P4' THEN period_rating.Rating ELSE NULL END)) AS Period4_Rating,
            GROUP_CONCAT((CASE period_rating.Slot_ID WHEN 'LC' THEN period_rating.Rating ELSE NULL END)) AS LC_Rating,
            GROUP_CONCAT((CASE period_rating.Slot_ID WHEN 'P5' THEN period_rating.Rating ELSE NULL END)) AS Period5_Rating,
            GROUP_CONCAT((CASE period_rating.Slot_ID WHEN 'P6' THEN period_rating.Rating ELSE NULL END)) AS Period6_Rating,
            GROUP_CONCAT((CASE period_rating.Slot_ID WHEN 'DT' THEN period_rating.Rating ELSE NULL END)) AS DT_Rating
        FROM Seclusion_Status
        INNER JOIN Students
            ON Seclusion_Status.Student_UPN=Students.UPN
        INNER JOIN Period_Rating
            ON Seclusion_Status.ID=period_rating.Seclusion_ID
        WHERE period_rating.Date = '$start'
        GROUP BY period_rating.Seclusion_ID
        ORDER BY Seclusion_Status.DateTimeAdded ASC

---

你能提供样品源数据和样品期望输出吗？现在我真的无法想象你在追求什么。我提供这个的最好方式是什么？基本上，对于表中的每一行，我需要以下列：学生姓名、教职员工、评论、第1期、第2期、第3期等。第1期应采用ID为P1的期间评分表中的数据，期间2，其中ID为P2etc@Shadow我现在用一些样本数据编辑了原始问题，希望能显示出我正在尝试做什么？？现在它变得更有意义了。这种技术称为动态数据透视或动态交叉制表（交叉表）查询。这已经在这里讨论了好几次了，很可能是《谢谢指点》的副本。我已经更新了原始问题中的查询，但仍然没有得到任何输出（尽管没有显示错误消息）。else分支中的null是什么意思？Khm，您可以阅读案例手册：如果您没有收到任何错误消息，但没有检索到任何记录，这意味着您的查询不会返回任何行。它可能是内部联接或where条件的结果。因为我看不到你的数据，所以我不能帮你。开始删除where条件，然后将内部连接更改为左/右连接，以查看向南的位置。我会首先使用mysql管理应用程序（例如像phpmyadmin这样的sg）运行sql语句，看看它是否有效。当你对sql进行排序时，然后将sql移动到你的php代码中。我确实阅读了手册，但当我在谷歌上搜索MySQL案例时，它把我带到了另一个没有提到其他内容的页面，这就是为什么我感到困惑的原因。