Hi, can someone help me to find the formula that I can fill out in column C to count all unique Shop_ID's per Article_ID?
<tbody>
A
B
C
1
Shop_ID
Article_ID
Count of Unique Shop_ID's for the linked Article_ID
2
205
15789
Result has to be '4'
3
55
43187
4
206
15789
5
205
15789...