I have a list with date column.
Items having the same dates should store the IDs together.
For eg: Item ID 1,12,15,etc. has the same date,then a column in these items should store all these IDs.
Is it possible to achieve this?
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It is possible with an Item Added Event Receiver which would update all the other Items with the same Date. I don't see any other option if the list is still changing.
Reference on how to add an Event Receiver
Pseudo Code: if list contains other Item with same Date write this to this and the other item
If you want to do this for a list which will not have any further changes you could do this by using a powershell script which iterates trough all list items and edits the items with the same dates.