[Help] - =countrows to count lines <>NULL

Hello,

I need one countrows in daX that doesnt count NULL

I tryed:

=countrows(filter(table;expression)<>"null"

=countrows(filter(table;expression)<>"NULL")

I have one table that in one colunm have if the person have or not answered the client.

If he yes, table show me one register;

If he dont, table show me NULL;

I do 

= COUNTBLANK() to calc NULL values.
I think subtract all clients - NULL values, daX show me one value but i need filter some data.

Someone can help me to do one measure like this?
=countrows(filter(table;expression)<>"null"

=countrows(filter(table;expression)<>"NULL")

Tks so much.