Join Columns
In the table view, there are two methods or you to define
joins. One is dragging and dropping, where you drag and drop one column to another.
The second method is highlighting the columns and clicking on the Join
Columns menu item.
At present, Join Columns means that highlighted columns in tables
within table viewer will be joined together. If there exists more than two
highlighted columns, Join Columns will also join these columns to each
other as well.
How to use Join Columns
First, highlight a column by clicking on it.

Second, highlight a second column.

Third, go to Join Columns and select it. This will connect your columns together. If the column types are different, a warning sign will appear.
