Table name: Copies

```
+------------------------------------+
|   group_id  |  my_id  |  stuff     |  
+------------------------------------+

|     900    |    1     |      Y     | 
|     900    |    2     |      N     | 
|     901    |    3     |      Y     | 
|     901    |    4     |      Y     | 
|     902    |    5     |      N     | 
|     902    |    6     |      N     | 
|     903    |    7     |      N     | 
|     903    |    8     |      Y     | 
---------------------------------------

```

The output should be:

```
+------------------------------------+
|   group_id  |  my_id  |  stuff     |  
+------------------------------------+
|     900    |    1     |      Y     | 
|     903    |    8     |      Y     | 
--------------------------------------

```

Hello, I have a table where I have to discern a 'good' record within a group\_id based on a positive (Y) value within the stuff field. I need the full record where only one value fits this criteria. If both stuff values are Y or both are N, then they shouldn't be selected. It seems like this should be simple, but I am not sure how to proceed.