I have a SQL query that puts records from one DE to another DE if that record does not exists in the second DE. The base works fine for me and i have the following query:

```
select t.Emailaddress 
from [All_subscribers_totaal] t
where t.Emailaddress not in ( 
select p.Emailaddress
from [Pak_t_Nieuws] p
) 

```

But when i try to add another DE (so i want to check if a record does not exists in DE A AND B AND C etc)it does not work even i don't get an error like so:

```
select t.Emailaddress 
from [All_subscribers_totaal] t
where t.Emailaddress not in ( 
select p.Emailaddress
from [Pak_t_Nieuws] p
) 
OR t.Emailaddress not in ( 
select pm.Emailaddress
from [Pak_t_Nieuws_Medewerkers] pm
)

```

Is there something i missed?

Thanks