Php 如何从MySQL设计数据透视表

我做了很多努力，但都没有成功，所以我在这里寻求帮助。我会尽量给出全部细节，这样我就可以帮助自己得到最好的解决方案

从我的MySQL数据库

Table (students)
--------------------------------
studentID | class_id | and other info


Table (class)
-------------------------------
classID | name | other info


Table (subjects)
--------------------------------
subjectID | name | class_id (references Class.classID)


Table (exam_type)
--------------------------------
exam_typeID | name | desc | start_date


Table (result)
---------------------------------------------
student_id | exam_type_id | subject_id | mark

在我的查询中，我有以下内容：

SELECT subjects.name, exam_type.name, result.mark FROM subjects 
LEFT JOIN result ON result.subject_id=subjects.subjectID 
JOIN exam_type ON exam_type.exam_typeID=result.exam_type_id 
WHERE result.student_id=$x 
ORDER BY 
subjects.name, exam_type.name

在查询中，$x是显示其结果的学生id

查询返回以下结果：

差不多到了这个程度，我现在没事了，我最头疼的是我想用这种方式来取代结果…看我的设计了

如果有人给我指出正确的方向，把第一张图片中的信息放在正确的位置，这将非常有帮助

----------------------------------------------
                            CA Tests  | Exams
-----------------------------------------------
subjects             |  1  |  2  |  3 | score
-----------------------------------------------
Agricultural science | 10  | 9   | 8  | 56
-----------------------------------------------
English language     | 12  | 13  | 12 | 43
-----------------------------------------------
French Language      | 11  |     |    |  

已解决：由JIML的解决方案解决

---

更改SQL，这样就不会得到两个同名的列

SELECT subjects.name, exam_type.name, result.mark FROM subjects 
-->
SELECT subjects.name, exam_type.name as test, result.mark FROM subjects 

然后你可以这样做（我已经模拟了db的结果）

---

然后，只需将其添加到您生成的表中即可。

让我试试看，我感觉很好，因为我认为这会起作用

$result = array(
  0 => array(
    'name' => 'Agricultural Science',
    'test' => 'CA 1',
    'mark' => 10
  ),
  1 => array(
    'name' => 'Agricultural Science',
    'test' => 'CA 2',
    'mark' => 9
  ),
  2 => array(
    'name' => 'Agricultural Science',
    'test' => 'CA 3',
    'mark' => 8
  ),
  3 => array(
    'name' => 'Agricultural Science',
    'test' => 'Exam',
    'mark' => 56
  ),
  4 => array(
    'name' => 'English Language',
    'test' => 'CA 1',
    'mark' => 12
  ),
  5 => array(
    'name' => 'English Language',
    'test' => 'CA 2',
    'mark' => 13
  ),
  6 => array(
    'name' => 'English Language',
    'test' => 'CA 3',
    'mark' => 12
  ),
  7 => array(
    'name' => 'English Language',
    'test' => 'Exam',
    'mark' => 43
  )
);

$data = array();
foreach ($result as $row) {
  $data[$row['name']]['marks'][$row['test']] = $row['mark'];
}

?>
CA test | Exams<br />
<?php
foreach ($data as $name => $row) {
  echo $name . ' | ' . $row['marks']['CA 1'] . ' | ' . $row['marks']['CA 2'] . ' | ' . $row['marks']['CA 3'] . ' | ' . $row['marks']['Exam'] . '<br />';
}

CA test | Exams
Agricultural Science | 10 | 9 | 8 | 56
English Language | 12 | 13 | 12 | 43