SQL - Rename one column based on values from other columns

Question

Let's say we're looking at the date of departure of a bus from the following cities:

City	Departure_Date	Truck Number
Berlin	2022-05-01	001
London	2022-05-22	020
Berlin	2022-05-22	030
London	2022-05-08	090

I need to rename the column 'City' if the departure_date is the same. This should be my output:

City	Departure_Date	Truck Number
Berlin	2022-05-01	001
Central	2022-05-22	020
Central	2022-05-22	030
London	2022-05-08	090

In this case we rename London and Berlin for 'Central' when they have the same departure_date

Thank you in advance for your help!

Answer 1

update t set t.City = 'Central'
from dbo.yourTable t
where exists (
  select
    1
  from dbo.yourTable tt 
  where tt.Departure_Date = t.Departure_Date
    and tt.id != t.id
  )