MySQL-获取列的所有唯一值，检查是否有特定值

首先，为这个糟糕的标题道歉，我不知道如何用一句话来形容它。 我有一个表-代码片段如下

mysql> select * from playlistfiles;
+-----------------------+--------------+-----------+
| FileName              | PlaylistName | FileIndex |
+-----------------------+--------------+-----------+
| File1                 | Image1       |         0 | 
| File1                 | Video1       |         2 | 
| File2                 | Video1       |         0 | 
| File3                 | Video1       |         1 | 
| File4                 | Image1       |         1 | 
| File4                 | Video1       |         3 | 
+-----------------------+--------------+-----------+
6 rows in set (0.00 sec)

我需要做的是获取所有文件名以及文件是否在播放列表中，并按文件索引对其进行排序，即对于Image1播放列表，输出应为

+-----------------------+------------+-----------+
| FileName              | InPlaylist | FileIndex |
+-----------------------+------------+-----------+
| File1                 |          1 |         0 | 
| File2                 |          0 |      Null | 
| File3                 |          0 |      Null | 
| File4                 |          1 |         1 | 
+-----------------------+------------+-----------+

而Video1将是

+-----------------------+------------+-----------+
| FileName              | InPlaylist | FileIndex |
+-----------------------+------------+-----------+
| File2                 |          1 |         0 | 
| File3                 |          1 |         1 | 
| File1                 |          1 |         2 | 
| File4                 |          1 |         3 | 
+-----------------------+------------+-----------+

---

简而言之，我需要能够从表中获取所有唯一的文件名，并检查它是否在给定的表中，如果在给定的表中，则按文件索引排序。

我将从以下内容开始播放：

select plf.fileName,
max(if(plf2.fileName = plf.fileName, 1, 0)) as inPlayList,
max(plf2.FileIndex)

from playlistfiles plf

left join playlistfiles plf2
on plf.fileName = plf2.fileName
and plf2.playListName = @playListName

group by plf.fileName