ORACLE Extract last data with different keys within the table

Question

DATA

A1 - B1 - DATA1
A1 - B1 - DATA2
A1 - B1 - DATA3
A1 - B2 - DATA1
A1 - B2 - DATA2
A1 - B3 - DATA1
A1 - B3 - DATA2
A1 - B3 - DATA3

Desired results

A1 - B1 - DATA3
A1 - B2 - DATA2
A1 - B3 - DATA3

Extract only the last data from each second column The third column [DATA] does not need to be sorted.

Answer 1

Based on your sample data, it seems that you want a simple group by:

select column_1, column_2, max(column_3)
from the_table
group by column_1, column_2
order by column_1, column_2;