I am not expert about Knime.I can not find to do it wiith Knime.
for examle I have 10 product code and I have 100 data for each product code.
and I want to parse first 60 rows of data for every uniq product code.
how can I solve it?
You can add row ID column with RowID node
then use Rank node to rank with standard rank by added row ID grouping by product code
and filter result by Row Filter for ranks lower then 61.
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