Difference Count vs Unique Count

KNIME Analytics Platform
1

What is the difference between “Count” and “Unique Count” in the Group By node?

2

Unique count only considers non-repeated items:

count([1, 2, 3, 1, 2, 3, 1, 2, 3]) = 9
uniqueCount([1, 2, 3, 1, 2, 3, 1, 2, 3]) = 3