Question: here's my sample data:

```
id  name      source
--------------------------
1   aaa       source1
2   bbb       source1
3   ccc       source1
4   ddd       source1
5   aaa       source2
6   bbb       source2
3   ccc       source2
4   ddd       source2
7   eee       source2

```

I'm trying to query all records where the value from "name" only occurs once (is unique) - so the desired output would be:

```
id  name      source
--------------------------
7   eee       source2

```

I've tried a combination of `GROUP BY name` and `HAVING` but it didn't work

```
SELECT name, source, COUNT(*) AS total FROM data
GROUP BY name
HAVING total=1

```

any ideas?

PS: how can i filter for "source"? `WHERE source = "source2"` won't help ..

Answer: 
You have added `slf4j-api` module, which is the API for adding logging statements to your code. It does not actually do anything with the logs, so they will be dropped. You will need to choose a backend such as `slf4j-jdk14` or `slf4j-logback13`.

The exception in your screenshot is not related.
You have to remove **test** scope in your dependency of slf4j simple dependency. This could be one of the reasons.