Concatenate

This node concatenates two tables. The table at inport 0 is given as the first input table (top input port), the table at inport 1 is the second table, resp. 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 table does 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

How to combine input columns

• Intersection: Use only the columns that appear in all input tables. Any other column is ignored and won't appear in the output table. Columns are matched by name.
• Union: Use all columns from all input tables. Fill rows with missing values if they miss cells for some columns.

If there are duplicate RowIDs

• Skip: Duplicate row identifiers (RowID) occurring in the second table and following tables are not appended to the output table. This option is relatively memory intensive as it needs to cache the RowIDs in order to find duplicates. Furthermore a full data duplication is needed.
• Append suffix: The output table will contain all rows, but duplicate RowIDs are labeled with a suffix. Similar to the "Skip" option this method is also memory intensive.
• Fail: The node will fail during execution if duplicate RowIDs are encountered. This option is efficient while checking uniqueness.

Enable hiliting

Advanced setting that enables hiliting between both inputs and the concatenated output table.

Views

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Links

• KNIME E-Learning Course: Concatenation

  www.knime.com/knime-introductory-course/chapter3/section3/concatenation
• How to combine multiple nodes into 1 excel sheet?by izaychik63 on 2020-10-11

  forum.knime.com/p/105278
• merge columns with different databy armingrudd on 2020-05-14

  forum.knime.com/p/91114
• Merging multiples excel files with different columnsby armingrudd on 2019-06-24

  forum.knime.com/p/62832
• How can I add a table under another one?by qqilihq on 2020-08-10

  forum.knime.com/p/99473
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Developers