loading data from one qvd not found in another qvd

[#1]

hi,

I want to load data from a qvd with comparing it to another qvd , that means load only data from qvd1 that is not found in qvd2 by a key .

[Anonymous]

More or less like this:

qvd2:
load
key,
...
from qvd2;
qvd1:
load
key,
...
from qvd1
where not exists(key);