我有以下示例数据:
id Ref User Task Refernce Start End rn
1 12222 Joe Bloggs Task 1 Ref001 24/02/2014 20/07/2014 1
2 12568 Joe Bloggs Task 1 Ref001 25/07/2014 12/10/2014 2
3 14757 Joe Bloggs Task 1 Ref001 29/10/2014 11/01/2015 3
4 12493 Joe Bloggs Task 1 Ref001 7/01/2015 6/04/2015 4
5 13694 Joe Bloggs Task 2 Ref001 3/04/2014 20/07/2014 1
6 85569 Joe Bloggs Task 2 Ref001 18/07/2014 12/10/2014 2
7 54769 Joe Bloggs Task 2 Ref001 24/11/2014 5/01/2015 3
8 …