RowID

This node can be used to extract the values of the current RowID of an input table to a new column. The node can also be used to replace the current RowID of the input table with a generated RowID of the format: Row0, Row1, Row2, ..., or by the values of a selected column (by converting the values to string). In the latter case, the node provides options to ensure uniqueness and to handle missing values in the selected column. If both extraction of the RowID and replacement of the RowID are configured, the node appends a new column with the values of the current RowID to the table and replaces the current RowID with the values of the selected column or the generated RowID. Note: Hiliting does not work across this node if the "Enable hiliting" option is disabled.

Options

Replace RowIDs

If selected the RowIDs will be replaced

Replacement mode

Replace the RowID by a newly generated one or the values of a column.

• Generate new: If selected, a new RowID is generated with the format: Row0, Row1, Row2, ...
• Use column: If selected, the RowID is replaced by the selected column.

ID column

The column to replace the current RowID.

Remove selected ID column

If selected, the column replacing the current RowID is removed from the table.

If ID column contains missing values

Fail if encountering missing values, or replace them.

• Fail: If selected, the node fails if a missing value is encountered in the selected column.
• Replace by "?": If selected, missing values are replaced with "?". We recommend also enabling the"Append counter" option to handle any duplicate missing values.

If ID column contains duplicates

Fail if encountering duplicate values, or make them unique.

• Fail: If selected, the node fails if a duplicate value is encountered in the selected column.
• Append counter: If selected, uniqueness is ensured by appending an incrementing number to duplicates.

Enable hiliting

If selected, a map is maintained joining the old with the new RowID. Depending on the number of rows, enabling this feature might consume a lot of memory.

Append column with RowID values

If selected, a new column with the values of the current RowID is appended to the table.

Column Name

The name of the column to append to the table.

Views

This node has no views

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Links

• Table column to variable (name of variable)by s.roughley on 2019-03-07

  forum.knime.com/p/55794
• Replace RowID by a flow variableby izaychik63 on 2018-10-03

  forum.knime.com/p/48352
• Creating column names with XPATH Nodeby armingrudd on 2019-05-07

  forum.knime.com/p/60125
• Loop for violin plot batch generationby armingrudd on 2020-04-15

  forum.knime.com/p/87627
• loop files in a folder with join rather than concatenateby HansS on 2024-07-31

  forum.knime.com/p/264947
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Developers