Number the rows by condition

[bruno29a]

Hi @spa_rr_ow , it’s probably not the most common use of the node in this case, but in general, the Moving Aggregation is a very useful node, especially for doing cumulative aggregation.

You can see a more common use of the node here:

Excel Concatenate of a Concatenate

Hi @ValeriaCedeno and welcome to the Knime Community. This can easily be done with the Moving Aggregation node And the aggregation to use would be Concatenate, and use the semi-colon (";") as delimiter. This should do: [image] Here’s some sample that I tested with: Input data: [image] Results: [image] You can then rename the column to “Concatenate”