基于相同的柱头在mysql中分组php

Question

我正在上传文件上传成功的文件上传项目。

我现在正在显示其用于存储上传的文件细节我上传的表是这样的：

+--------------------+--------------------+------------------+-----------+ 
| projectId  | filename   | projectDetails |ProjectName | 
+--------------------+--------------------+------------------+------------+ 
| pid1    | admin.zip   | This Is A Test |myProject | 
| pid1    | admin1.zip   | This Is A Test |myProject | 
| pid2    | admin2.zip   | This Is A Test2 |myProject2 | 
| pid2    | admin3.zip   | This Is A Test2 |myProject2 | 
| pid1    | admin4.zip   | This Is A Test |myProject | 
+--------------------+--------------------+------------------+------------+ 

可我知道，我可以得到这样的

+--------------------+--------------------+------------------+-----------+ 
| projectId  | filename   | projectDetails |ProjectName | 
+--------------------+--------------------+------------------+------------+ 
| pid1    | admin.zip   | This Is A Test |myProject | 
|     | admin1.zip   |     |   | 
|     | admin4.zip   |     |   | 
+--------------------+--------------------+------------------+------------+ 

Answer 1

输出什么关于使用此查询：

select projectId, GROUP_CONCAT(distinct filename) as filename, projectDetails, ProjectName 
from yourtable 
group by pid1