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The Combine Columns command is used to combine the values of two or more columns from the command input with a separator you choose to create a new column.

To configure a Combine Columns ETL command, you need to:
Provide a name for the new column.
A separator to use when combining the values: semicolon, comma, tab, space, other, or none.
Whether you want to remove the original columns that were combined.
The columns you want to combine and the columns to sort the output.

In the example in the screenshot, we join the first_name and last_name columns using a comma to create a new column FullName.