Hi @takbb,
Thank a lot for your patience and caeful answer.
And I am very sorry for my data sources bothers you.
I changed my workflow flow your advice, but it still have some problem.
Excel Reader node an error occurs near the end of the loop.
My Excel Reader node is different from you, your node “select sheet with name” is gray, but my node is same as usal, it’s not gray.
Data result have two sheet(first and second) is wrong.
Data Result-two sheet is wrong.xlsx (2.2 MB)
My workflow
KNIME_data collection update.knwf (30.9 KB)