How could I identify user due to specific events?

richard

Hi, 

my user journey is :

 

 

For event 2, the anonymous user registers an online event as a guest, but inputs a user’s email  to register (user F560) so our backend will send an event to Amplitude and note the event was executed by “user F560”.

In this case, although the anonymous user didn’t log in, we can still identify he/she is user F560. I wonder whether there is any way to update the user property of event 1, 3 to user F560?

 

Thanks!

Nehita I.

Hi richard , 

This is Nehita from the  Amplitude Support team, thanks for writing into the Community! 

To answer your question, once an event is sent in, it can’t be edited. However, you can add the user ID to the new events but not to the past events. It’s important to remember that Amplitude is an events-based platform, and so any events we ingest are ingested with the user and event properties at the time they occurred. Our event data is historical and immutable and cannot be changed once ingested. So when you query on some Event A where some_property=X, we are looking for the users who have triggered Event A and some_property was equal to X at the time the event occurred. 

I hope this is helpful, but please let me know if you have any follow-up questions!

Best,

Nehita