如何显示动态数据透视表的最小和最大价值

Question

我创建了一个数据透视表从dt_table与dt_k

table dt_k 
+------+--------+-----+ 
| id_k | name_k | ott | 
+------+--------+-----+ 
| 1 | item 1 | ss | 
| 2 | item 2 | ss | 
| 3 | item 3 | ww | 
| 4 | item 4 | dd | 
| 5 | item 5 | asa | 
| 6 | item 6 | rr | 
+------+--------+-----+ 

dt_table 
+------+--------+------+----+ 
| id_t | id_u | id_k | k | 
+------+--------+------+----+ 
| 1 | 22 | 1 | 2 | 
| 2 | 22 | 2 | 3 | 
| 3 | 22 | 3 | 23 | 
| 4 | 22 | 4 | 4 | 
| 5 | 22 | 6 | 34 | 
| 6 | 24 | 1 | 23 | 
| 7 | 24 | 2 | 34 | 
| 8 | 24 | 3 | 54 | 
| 9 | 24 | 4 | 21 | 
| 11 | 24 | 6 | 44 | 
+------+--------+------+----+ 

我使用数据透视表加入到行转换为列这是我的代码：

SET @sql = NULL; 
SELECT 
GROUP_CONCAT(DISTINCT 
CONCAT(
    'max(case when col = ''', 
    col, 
    ''' then value end) as `', 
    col, '`') 
) INTO @sql 
FROM 
(
select concat('op_', `id_k`) col 
from dt_table 

) d; 
SET @sql = CONCAT('SELECT d.id_u as id,', @sql, ' 
       from 
       (
       select id_k, id_u, concat(''op_'', `id_k`) col, k value 
       from dt_table 

      ) d group by id_u '); 


PREPARE stmt FROM @sql; 
EXECUTE stmt; 
DEALLOCATE PREPARE stmt; 

这个代码给出像以下

+------+------+------+------+------+------+ 
| id_u | op_1 | op_2 | op_3 | op_4 | op_6 | 
+------+------+------+------+------+------+ 
| 22 | 2 | 3 | 23 | 4 | 34' | 
| 24 | 23 | 34 | 54 | 21 | 44 | 
+------+------+------+------+------+------+ 

我需要此表显示的最低和最高值对等个每列的结果是

+------+------+------+------+------+------+ 
| id_u | op_1 | op_2 | op_3 | op_4 | op_6 | 
+------+------+------+------+------+------+ 
| 22 | 2 | 3 | 23 | 4 | 34 | 
| 24 | 23 | 34 | 54 | 21 | 44 | 
+------+------+------+------+------+------+ 

+------+------+------+------+------+------+ 
| id_u | op_1 | op_2 | op_3 | op_4 | op_6 | 
+------+------+------+------+------+------+ 
| min | 2 | 3 | 23 | 4 | 34 | 
| max | 23 | 34 | 54 | 21 | 44 | 
+------+------+------+------+------+------+ 

感谢您的帮助.. 此资源的近期工作http://sqlfiddle.com/#!9/297674/1

Answer 1

哪一部分的问题做如下不能解决？

<?php 

include('path/to/connection/statme.nts'); 

$query = " 
SELECT id_u 
    , id_k 
    , k 
    FROM dt_table 
ORDER 
    BY id_u 
    , id_k; 
"; 

$result = mysqli_query($conn,$query); 

$array = array(); 

while($row = mysqli_fetch_assoc($result)){ 
$array[] = $row; 
} 

foreach($array as $v){ 
$new_array[$v['id_u']][] = $v['k']; 
} 

print_r($new_array); 
?>