I have a question about KNIME. In the Expression node, my formula always uses the column “a”. However, the previous step is the result of a pivot operation, and the column “a” might not appear. If it doesn’t appear, the Expression node will throw an error. How can I avoid this error?
如何避免公式引用出错.knwf (1.9 KB)
@lanfengye Your workflow is empty.
You can try this method.
Create an empty table with column “a”, then concatenate between your previous step node and pivot node.
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