How to classify in the good categories?

[eluser]gRoberts[/eluser]
If you don't "group" your query, what results do you see? I'm not sure if I understand what you mean by "it shows me an input on two".

I assume this means that without the group, you get one result and with the group, you two two results, or vice versa?

Grouping will consolidate multiple rows with the same values into one row. Are you looking at doing this, or are you simply wanting to display the list of items in order of Category?