ID colum

why I lost the ID column when read from a CSV (I can't manage it in the next step), doesn't happen when read from a database (a new ID column is created be knime)

You can select the open Has Row Header" in the configuration dialog of the CSV Reader, but still you should see the ID as individuell column in the outpu table? The Database Reader creates new RowIDs (if available based on the ID info from the DB).