See how to join two data sets by one or more common columns using base R’s merge function, dplyr join functions, and the speedy data.table package.

Open the "Show records from" drop-down menu and select the table you want to use as the primary data in the new report. Enter a name for the report and choose a layout type, then click "Next." ...

However, Hadley Wickham notes that the double-bracket format only works for one value. If you are doing something like creating a new column in a data frame, stick to unname ().