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Copy RowID values into a new column for graphing

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I have a string field that holds model year of automobiles in a table of about 100K rows.  I used the Value Counter node to get a count of vehicles by model year and would like to show that on a histogram.

The problem is that the model year has now become the RowID column, and I can't get histograms to recognize it as a value.

How do I copy the value of model year from Row ID into another column that I can use as the x axis while the count of vehicles per year can be on the y axis?


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