set analysis count

[mambi]

Hi, I have a the following structure:

Contactid	Target	DATE
1	A	2000
2		2000
3	B	2000
4	C	2000
5	A	2000
1		2000
6	C	2000
2		2001
4	B	2001
5		2000
3		2000
4		2003

I am trying to get this using an expression :

count the number of Contact IDs for each target, like this :

IF A CONTACT HAS ONE TARGET COUNT ONLY THE 1ST NON EMPTY

IF A CONTACT HAS MANY TARGETS (ex: CONTACTID => 4) COUNT ONLY THE 1ST NON EMPTY WITH LATEST DATE

ALSO, I NEED TO COUNT Contact IDs WITH NO TARGET

so the results would be  :

Target	count
A	2
B	2
C	1
	1

if i use only count(target) i'm getting this :

Target	count
A	2
B	2
C	2
	6

I am trying to get this done with Set analysis  but no results :-((:

Thanks;