SQL conceptual query help

Hi,

I was wondering if someone could help me with this. Let's say there are two overlapping tables A & B and I want to select a certain data point when it is NOT in the overlapping area. For this example, I will use Person ID. I want to be able to select all Person IDs that are not in both tables. I can do one or the other with:

Select
Person ID

From
Table A

Where
Person ID not in (Select Person ID From Table B Group By 1)

Group by
1


Is there a way to get all of them at once rather than having to write the query both ways? Thanks in advance!