from mdb..ca_contact as cnt
where not exists (
from mdb..usp_contact as usp
where cnt.contact_uuid = usp.contact_uuid
How to know if i do the right thing?
Just counting the differences
select count(0) from mdb..ca_contact
select count(0) from mdb..usp_contact
Comparing the quantity of register on Query A need to be B-C or ....
select count(0) -(select count(0) from mdb..usp_contact )