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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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Now that I'm looking at the updated description, I think it is clear enough that an example is no longer necessary. I will suggest a small grammar edit, though.
"All your products are in the database, that you have created after CodeWars SQL excercises!:)"
should become:
"All of your products are in a database that you created for CodeWars SQL excercises!:)"
Thank you fo updating :)
No tests for Javascript.
The description needs some serious polishing. I'm mostly echoing previous commenters.
On revision of the description, this would be a fine beginner level kata.
Asks for unique products in description, but adding a DISTINCT causes failure.
Making a column the same name as the table is frustrating.
Needs to explicitly state the proper country name in products table, "US" or "United States of America".
An example would really help.
I too came away from this kata thinking "Oh, THAT'S what they were looking for". Reading the error codes was more helpful than anything.