问题
I have a data set representing deliveries made by several vehicles, which can each load and discharge at different locations. I am trying to find out how many vehicles it took to do all deliveries, while grouping/merging all trips that loaded within +- x days. For example:
- vehicle V1 could load in Zone A (date X) and B (date X+2), and discharge in Zone C and D, that would count as 1 vehicle/trip because it loaded within 2 days.
- V1 could also simply do Zone A (date Y) to Zone C, that would count 1 trip as well
This is how the raw data looks like:
Id LoadArea LoadDate Vehicle Discharge Area Qty
456559 Zone A 15/07/2019 V1 Zone Z 64
408481 Zone B 13/07/2019 V1 Zone X 70
365566 Zone A 12/07/2019 V1 Zone Y 26
244634 Zone C 12/07/2019 V2 Zone X 10
453409 Zone D 10/07/2019 V2 Zone Z 53
183776 Zone A 20/04/2019 V1 Zone Y 13
379698 Zone A 20/04/2019 V1 Zone Z 21
370324 Zone D 28/02/2019 V3 Zone W 39
This is what I am aiming to get to:
LoadArea LoadDate Vehicle Qty
Zone A;Zone B 12/07/2019 V1 160
Zone C;ZoneD 10/07/2019 V2 63
Zone A;Zone B 20/04/2019 V1 34
Zone D 28/02/2019 V3 39
The LoadDate returned when merging records that are less than +- X days away would ideally be the earliest one of the records being merged.
Would anyone have an idea how to do this - i've been stuck on this for days now.... Thanks for your help!
来源：https://stackoverflow.com/questions/63059123/sql-merging-records-based-on-date-range