Hi all, I have a table like this: Section | start time | end time Aaa | 01Jun2025:00:01:10 | 01Jun2025:00:09:02 Aaa | 01Jun2025:00:03:10 | 01Jun2025:00:12:00 Aaa | 01Jun2025:00:10:09 | 01Jun2025:00:18:08 Bbb | 01Jun2025:00:01:02 | 01Jun2025:00:03:01 Bbb | 01Jun2025:00:02:10 | 01Jun2025:00:09:08 … What I want to do is to check all overlapping and create a new column to label each row. Like this: Section | start time | end time | group Aaa | 01Jun2025:00:01:10 | 01Jun2025:00:09:02 | 1 Aaa | 01Jun2025:00:03:10 | 01Jun2025:00:12:00 | 2 (start time is earlier than previous end time, so label as 2) Aaa | 01Jun2025:00:10:09 | 01Jun2025:00:18:08 | 1 (start time is later than group 1 end time, so group 1 is released and can assign to this row) Bbb | 01Jun2025:00:01:02 | 01Jun2025:00:03:01 | 1 ( new section restart the calculation from group 1) Bbb | 01Jun2025:00:02:10 | 01Jun2025:00:09:08 |2 … I tried to loop through all row, and record all “group” latest end time in macro variable. Then compare each row endtime with each variable. But it takes so slow. Any idea? ... View more