Qlikview aggration with conditions - expression

Question

I have some data like below -
id, fn, ln, logdate
1, Rob, Hep, 01-04-2010
2, Rob, Hep, 09-04-2010
3, Rob, Hep, 10-10-2012
4, Rob, Hep, 01-12-2009
5, Peter, Cheng, 02-10-2010
6, bob, Pen, 05-10-2009
7, Peter, Cheng, 01-10-2009
8, Kim, Rany, 08-01-2010
I will have to write an expression
Group the above data by fn+ln.
From the Group get the record of min(logdate)
For each min logdate from above, find count if the date is above '01-01-2010'
So in this example -
I should get count as one. (Rob Hep's min log date is 01-12-2009 and Peter Cheng's 01-10-2009 and bob Pen's is alos 05-10-2009 all of them are before 01-01-2009)
Can some one help me in writing the expression for it please?

Answer 1

First the load script:
Table:
Load id,
fn,
ln,
logdate,
fn & ' ' & ln as name,
num(Date#(logdate, 'DD-MM-YYYY')) as numdate inline [
id, fn, ln, logdate
1, Rob, Hep, 01-04-2010
2, Rob, Hep, 09-04-2010
3, Rob, Hep, 10-10-2012
4, Rob, Hep, 01-12-2009
5, Peter, Cheng, 02-10-2010
6, bob, Pen, 05-10-2009
7, Peter, Cheng, 01-10-2009
8, Kim, Rany, 08-01-2010
];
I added one field for the name and an other one for the numeric value of the date. That makes it easier (even possible?) in the set expression.
Then I added a variable
vNumdate =num(date#('01-01-2010','DD-MM-YYYY'))
so you can edit it in the dashboard.
In the dashboard I have all the fields, a textfield containig the vNumdate and a
diagram (type table).
The dimension of the diagram is the field name
And the formulas are:
Min date
=min(numdate)
Count since 1.1.10
=Count({$<numdate = {">=$(vNumdate)"}>} numdate)
And thats the simple dashboard in qlikview:
(Hope I got it right.)