Hi yall

so this is my gallery as u can see, I have an employee number on the main gallery, then a gallery inside this gallery, that brings me the info from another table using the employee number of the main gallery and also another gallery that does the same ,yes I'm trying to see if its possible to work with 3 different SQL tables joined by an employee number
So my question is, I don't need all the employees on the main table, I just need those that doesn't have any register on the other SQL tables, is that possible?
For example filter the main gallery if the other galleries are empty if the two of them are full, then don't show that employee
Thanks in advance!