After reading the two tables you can use the Constant Value Column node to add the Stand information to each table. Afterwards you can write the two tables below each other using the Concatenate node.
Regarding the difference. Do you mean the difference between to consecutive months in the same Stand, or the difference between May in Stand P04 and May in Stand P05?
But I have a problem with the “Lag column” node and the “math formula” node. I think it’s because my two tables have different numbers of rows (Table 1: 1520 / Table 2: 1527). Or, from which table has to be the number of rows for the “lag column” node and how do I have to ajust the “math formula” node?
Hi @Kathrin , I found a workaround for this theme. But thanks alot for your Workflow it really helped me alot to understend KNIME more and more by my first steps!!!