Concatenate (Optional in)

This node concatenates tables, inputs are optional. Columns with equal names are concatenated (if the column types differ the column type is the common base type of both input column types). If one input table contains column names that the other tables do not, the columns can either be filled with missing values or filtered out, i.e. they will not be in the output table. The dialog allows setting the following parameters:

Options

Skip Rows

Duplicate row identifiers (RowID) occurring in the second table are not appended to the output table. This option is relatively memory intensive as it needs to cache the row IDs in order to find duplicates. Furthermore a full data duplication is needed.

Append suffix

The output table will contain all rows, but duplicate row identifiers are labeled with a suffix. Similar to the "Skip Rows" option this method is also memory intensive.

Fail

The node will fail during execution if duplicate row IDs are encountered. This option is efficient while checking uniqueness.

Use intersection of columns

Use only the columns that appear in all input tables. Any other column is ignored and won't appear in the output table.

Use union of columns

Use all columns available in the input tables. Fill rows with missing values if they miss cells for some columns.

Enable hiliting

Enables hiliting between both inputs and the concatenated output table.

Views

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Workflows

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Links

• Merging several *.csv filesby qqilihq on 2019-09-10

  forum.knime.com/p/69706

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