I have a table as shown below:
| Month | Order No. | Order Type |
|---|
Jan | 11111 | New Order |
| Jan | 22222 | New Order |
| Jan | 33333 | New Order |
| Feb | 44444 | New Order |
| Feb | 55555 | New Order |
| Feb | 22222 | Existing Order |
| Feb | 33333 | Existing Order |
I would like to using a function/formula to create the order type column.
If the order no. appear in previous month, then it is an existing order.
If the order no. do not appear in previous month, then it is a new order.
Is there any way to do it? Thanks for the help.
