How to count unique values

[lalonader]

I have a report that tells how many jobs a worker do, but i need to report how many days he/she showed up...

I need something like this:

George

Plumbing 2/2/2008 $4.50

Fix Tube 2/2/2008 $9.00

Plumbing 2/4/2008 $9.00

Plumbing 2/5/2008 $9.00

Worked Days: 3 $31.50

Anyone can help?

[comment]

See here:

http://www.fmforums.com/forum/showtopic.php?tid/135476/

[lalonader]

B) The first solution addressed my need.

Thanks!