MySQL Subquery in Query Builder

[updates]

HI,

thank you very much for your solutions, sometimes things are easier than they appear…
I did the same:

1. I inserted GET Variable Id and make the steps as you said:
   

2. Then made the Repeat picking up the table values I needed
   

3. In the second query done inside the repeat, I used the following conditions:
   

   

4. I got the page with listed ALL the users, then I simply used HIDE the line of the table

   if query 2 has items.

5. Got the result.

Is that ok Nikolas ?
thank you very much for your support !!

Have good summer
Roberto