my data is presented as follow.
Col1 Col2
A x
A x
A y
B x
C z
I simply want to represent Column 1 on a graph in the X axis with the number of unique references to of the data in Column 2 as Y axis.
Basically my graph would be like A (2) ; B (1) ; C (1).
I'm not sure how to use COUNTD on that purpose.