I have last_modified (datetime) column and based on that, I want to have rows where row consist the last two modified concatenated values in the column.
It should contain all the last modified values combination.
Existing Values
Value Last_modified_date
0 25-01-18
1 26-01-18
5 16-02-18
2 02-03-18
4 21-05-19
7 15-09-19
**Required Format:**
old_value (highphen) current_value
0 - 1
1 - 5
5 - 2
2 - 4
4 - 7