在mysql php中基于相同的columid进行分组

Question

我正在处理文件上传成功的文件上传项目。

现在我正在寻找显示我的上传表格，用于存储上传文件的详细信息，如：

+--------------------+--------------------+------------------+-----------+
|    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   |
+--------------------+--------------------+------------------+------------+

我可以知道我可以得到像

这样的输出

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

Answer 1

使用此查询怎么样：

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