Here's a table with column selection:
| Letter | Number | 
|---|---|
| B | 2 | 
| C | 3 | 
Try selecting & copying some text from it!
For comparison, here's a garden variety table. Selecting text in the right column also selects text in the left column. You can't copy text from 2+ rows in a single column.
| Letter | Number | 
|---|---|
| B | 2 | 
| C | 3 |